Method #2:
Applying heat directly to the wallpaper borders can help loosen it up. Use a hairdryer to perform this job. Set the hair dryer settings on high, position it about 8-10 inches away from the wallpaper, and direct the heat towards it for a couple of minutes. The heat will soften up the glue, allowing you to peel the wallpaper easily; it should come off smoothly. However, if it does not, then use a broad putty knife.