If the wallpaper is vinyl remove a corner at the lower end of the seam. The length
can then be slowly pulled away from the wall, leaving the backing paper attached to
the wall.
Depending on the condition of the backing paper it can either be left on
the wall and used as lining paper for the new wall covering, or it can be stripped
fairly easily with water and a scraper. See
Removing wallpaper for more details.
