How to Hang Unpasted Wallpaper

Equipment List:

Screwdriver, Level, Chalk line, Pre-mixed wallpaper pasted, Brush or Roller, Wallpaper smoothing tool or smoothing brush, Ladder, Putty knife, Utility knife or razor, Sponge or wet rag.

1. Remove items from the walls and items near the walls. You may want to use drop cloths to protect the floor just in case you drip paste or drop a piece of paper. Inspect the walls; clean them if they are dirty and make any repairs if they are damaged. Holes or rough spots may be visible through the wallpaper. If the walls already have wallpaper, this must be removed. Remove all covers for light switches and outlets. Turn off the electricity to these for extra safety while you work.
2. Apply painter's tape around trim in the room, then coat the walls with primer, using a paint roller to cover large areas and a brush for smaller ones. Let the paint dry completely.The paint helps the paper adhere better.
3. Examine the room and pick a corner to start in. An inconspicuous area, such as a corner behind a door or a curtain, is a good place to begin. You'll have the advantage of the seam being less noticeable if the paper pattern doesn't match perfectly when you reach the last piece.
4. Measure horizontally from the corner the width of your wallpaper and make a mark. Put a level against this mark and draw a vertical line. You can extend the line from the ceiling to floor or use a chalk line to make the mark. Use this line to ensure that your first piece of paper is straight. You should do this when you start papering on each new wall, and you can do it for each new piece of paper for accuracy.
5. Measure the height of your wall. Cut a piece of wallpaper that is about 4 inches longer than this measurement, which gives you room to adjust and trim once you hang the paper.
6. Lay the strips on a flat surface, like a table, printed side down. You should cover your surface in something protective, like some plastic, to contain the mess.
7. Apply paste to the top half of the paper, the half that you want near the ceiling, using a roller or a brush. Fold the paper on itself so the top of the wallpaper strip is at the middle of the length of the strip. You should not make a real crease in the paper; be gentle when you fold.
8. Apply paste to the bottom half of the paper with a roller or brush, then fold it towards the middle, the same way you folded the top half. The entire paper should be folded at this point with the two ends of the strip of paper meeting in the middle.
9. Wait for about 5 minutes. This is important; the glue needs some time to "cure" and the paste and water need to soak into the paper. This is known as "booking." While 5 minutes is usually sufficient, you should check your paper to see if there is a recommended booking time, as some types must book longer.
10. Take the paper to the corner where you drew a line for guidance and unfold the top half. Place the paper on the wall, with the top overlapping onto the ceiling by a couple of inches. Slide the paper into place so the outer edge lies perfectly against the guideline you drew.
11. Smooth the paper gently using your hands, then a wallpaper smoothing tool or a smoothing brush. This both helps the paper stick and pushes out unsightly bubbles. Don't be so rough that you stretch the paper. Work from top to bottom and from the middle to the outer edge when smoothing. Unfold the bottom half of the paper and smooth it the same way.
12. After hanging several sheets, put a wide putty knife firmly against the corner between the wall and ceiling. Cut along the edge of the putty knife using a utility knife, razor or similar tool in order to remove the excess paper. Use the putty knife to guide your cuts and to be even. The sharper the utility knife, the better; don't use a dull tool that might pull and stretch your wallpaper. Repeat the process at the floor or baseboard. If the paper begins to rip or tear, give it a little more time.
13. Wipe off any paste that might have smeared on the walls or baseboards with a damp sponge. You can also use the sponge to further smooth the paper.
14. Cut a new piece of paper. With each new paper, hold the paper up to the wall before cutting to be sure that you have enough paper to match the pattern. Prepare the paper with glue and apply to the wall in the same manner that you did the first. Repeat until you have covered the entire room. Cut out squares around your outlets and light switches. You can turn the electricity back on and replace the covers once the paper has dried completely.

You can download the instructions here