Hanging the next length of paper
When the next drop is pasted and ready to hang, repeat the process.
Use the edge of the previous drop to line up with.
Line up the pattern
You may find it easier to position the paper on the wall a fraction away from the edge of the preceding piece and then to slide it into position.
Be sure to maintain the pattern match. Continue hanging paper in this fashion to the end of the first wall.
If, as happens with many papers, the patterns don’t match up all the way down, make sure that it matches at eye level. The mismatches above and below eye level will not be so noticeable.
Trimming wallpaper at the corner
At the end of the wall, you'll need to trim the paper into the corner. Do not trim it exactly to the corner but allow it to run round by about half an inch. This generates a small overlap in the corner, which provides a really professional finish. Without this, it is highly likely that the paper in the corner will not join perfectly all the way down and a gap may be left.
The corner is unlikely to be perfectly square. When hanging the first piece on the next wall you will need to mark another vertical line.
You will also need to match the paper in the corner. The previous piece was trimmed, so you cannot use the offcut since it too will need to be trimmed. Take a new piece, measured and cut to allow for both trimming and matching. If more than a couple of inches will need to be trimmed, cut off most of it before pasting (but remember to allow enough for the final trimming at the corner).
Mark the vertical line on the wall for the width of this next piece, allowing for it to be trimmed to match.
Continue papering this wall as for the first.
As the paper is unlikely to match in the final corner, try to plan so that this is in the least noticeable part of the room.