The first thing to do is to estimate how many rolls of wallpaper are needed. Measure the height and width of the walls to obtain the area. Wallpaper usually comes in rolls of four pieces although the length required will vary depending on the dimensions of the room. Patterned paper may vary as the paper will need to be cut to continue the pattern. So you do lose some

(make sure walls are free of old wallpaper and all cracks have been filled and rubbed down

Size the walls (use a roller to spread the wallpaper paste over the walls this is so when you place the wallpaper on the wall you can slide the paper into place).

Lining paper can be used to to give the walls a good finish, especially if the walls have previously received a coat of gloss or oil based paint or just not in good condition. Lining paper can be hung either horizontally or vertically to line up the joins of the wallpaper.

Before hanging the lining paper, use a spirit level to line the paper by making a mark across the level. Using a similar method to covering the ceiling, cover the lining paper in paste (you can use a roller to paste your paper working from the middle out but be careful when dragging the roller back over the edges as not to get paste on the face side of the paper)and fold the paper in a concertina style. Now open out each fold as you apply the paper to the wall. After the paper is stuck to the wall, smooth out the length of the wall to smooth out any bubbles or uneven textures, Continue this method for the entire room, ready for the wall -paper to be applied.

Now measure the distance from the top to the bottom of the wall and mark out and cut the desired length from the roll. Leave an overhang of about half a inch and only cut one length at a time to maintain continuity.

If you are using patterned wallpaper make sure the pattern is facing the right way up. When using a bold design choose a focal point of the room, such as by a fire place or main wall of a room, and start from the centre of the wall. Cut the paper so that a whole pattern is visible at the top of the wall. If you are using a more subdued pattern then start from the corner of a room in a less noticeable place.

Now that the wallpaper have been measured and cut they are ready for pasting. The paste will need to be mixed for the desired thickness of the job. When choosing paste look out to see if it contains fungicides, as fungicides are necessary to hang vinyl and washable wallpapers.

Now you are ready to hang the wallpaper. Start by laying the lengths of paper face down on a table. Take your paste and apply it from the middle out and top to bottom, spreading the paste evenly and taking it over the edges as possible but don’t paste from the outside edge in taking care not to get any paste on the front.

To avoid any unsightly blistering it is best to make sure that the paste is applied evenly and covers the whole of the back of the paper.(if not your not sure if you have covered all the paper bend down to the level of your pasting table and look down the paper to see if you have missed any) If blisters start to appear after the wallpaper has been hung it is best to smooth out with a wallpaper brush and work from the middle out towards the wallpaper joins). If paste accidentally goes onto the front of the paper it will need to be washed off immediately to prevent spoiling the finish. After the paste has been applied, fold the lengths of wallpaper into three to let the paste soak into the paper. Soaking the paper allows any moisture of the paste to expand and reduces the appearance of bubbles and blistering.  (The wallpaper paste instructions will tell you how long to let it soak for)

While the paper is soaking or before you even paste then paper-. Mark a long pencil line using a spirit level to make sure your line is straight .and use the marking to line up the lengths of wallpaper. Try to avoid placing the paper over the mark instead place it along side to the line. To hang the wallpaper unfold the top part of the length and stick the paper loosely to the top of the wall. Position the paper roughly half inch over the top of the wall and push the wallpaper into place. Once the wallpaper is hung, use a paperhangers brush to smooth out any bumps. Unfold the bottom and apply the other half of the wallpaper to the wall, smoothing out any further bumps.

Now the wallpaper is in position, use scissors or a small blade to cut off any excess. Finally stick down the edges of the lengths and remove any surplus paste with a damp sponge.

To apply wallpaper around corners, first you need to measure the distance from the last length of wallpaper applied to the corner required. Next, cut a length of paper downwards to the width measured earlier adding an inch of overlap onto the measurement to make an overlap which will fit the corner. keep in mind that if the wall is unevenly plastered then an excess overlap may be needed to compensate. Apply the paste to the back of the wallpaper, taking care to apply the paste evenly into the corner. The excess length from the previous cut should be pasted from the corner as this will make the join less prominent. From here you can carry on applying the wallpaper to the rest of the room.

This method can be used to complete outside corners. Adjust the overlap to roughly two inches to accommodate the difference.

When hanging the wallpaper close to electrical sockets make sure to turn off the mains power first. The wallpaper needs to be smoothed gently over the fittings and then punctured by a small blade. Cut in a diagonal direction across the fitting about an inch from the corner beyond each corner of the fitting. Lightly smooth the remaining paper along the outline of the fitting, compensating for the outline and trimming.

Alternatively, you can loosen the fitting from the wall (ensuring that the mains electricity is turned off first) and fold the excess paper beneath the fitting. Circle shaped fittings can be solved using a similar method. This can be done by cutting a star shape in the paper around the fitting, however this can prove fiddly and mistakes may affect the fitting. As this involves an electrical fitting care must be taken particularly with the application of paste.

An Alternative, Pre-pasted Wallpaper

If you are particularly inexperienced or pushed for time, pre-pasted wallpaper may appeal to you. Cut the wallpaper and prepare it into a loose roll. Then, instead of brushing on paste, take the paper and allow it to soak in a trough or basin of water for roughly a minute (directions will be included on the packaging as times can vary across different types of wallpaper). After a minute or so the water will have reacted with the glue and will be ready to be taken out. Take care to remove the rolls slowly so that any water can run into the trough or basin instead of being absorbed by the paper. Apply the paper as usual and then wipe down the surface with a clean, dry sponge to soak up any excess water.

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