If the archway forms part of a wall section - above a window, in an alcove or
between two rooms add an extra inch of paper to follow the length of the shape
of the arch along the wall. Cut the shape, paste and hang.
Smooth the paper
down onto the wall, joining the seams as with all wallpaper lengths. Where it
overhangs the arch, cut small V shapes all the way round the arched section.
This will enable the paper to turn under the arch smoothly and neatly without
any creasing.
Once the wall section above the arch has been completed, cut a
length of paper the width of the archway. If necessary, try to match the pattern
before cutting. Start at the lower end of the arch and line up with the adjacent
papered wall. Then start at the other end and line up in a similar way, allowing
the two pieces to meet at the top of the arch, in the centre.