Planning your approach
Successful wallpapering takes time, patience and careful planning. Some necessary exercises before you start:
CHECK YOUR PAPER
Be sure that all the rolls have the same run numbers. If they don't, return them and reorder. Open and inspect each roll for defects. This is particularly important for expensive papers that represent a sizable investment. Reorder if you must replace a bad roll.
FIND THE STARTING POINT
Where you should begin varies with the design of the room and the pattern of the paper. Mark with a ruler and pencil exactly where each strip will go. This lets you anticipate problems and work out solutions ahead.
SET UP THE ROOM
Clear out as much furniture as you can, and stack the rest in the middle of the floor. Put dropcloths or newspaper around the perimeter of the room and under your pasting table.
ORGANIZE YOUR TOOLS
Set up the stepladder at your starting point. If you will be pasting at the large table, use another table for your tools or wear a carpenter's apron to hold them. Buy several dozen razor blades for your trimming knife and provide a safe place for discards.
STUDY THE PAPER PATTERN
Hold it up to the ceiling line. Check where the patterns repeat looks best. If the ceiling-wall juncture is uneven, for example, don't use a horizontal band as your starting point at the top.
Source: Reader's Digest New Complete Do-it-yourself Manual