1. Set border guidelines
Using a carpenter’s level, draw border guidelines for the top and bottom edges of the border, allowing the lower guideline to overlap the existing wallpaper.

2. Hang the border
Hang the border according to the top guideline. Using a straightedge or broad knife at the bottom edge of the border, cut the existing wallpaper with a razor or utility knife and remove the excess. Then smooth down the border and roll the seam.

2. Finish the job
Hang the bottom wallpaper to butt with the wallpaper above. Then hang the border, aligning it with a design element of the wallpaper above and below.