Many tool rental and wallpaper outlets rent electrical steamers to do-it-yourselfers. These appliances typically consist of an electrically heated water tank connected by a long hose to a steamer plate with a perforated face. Here's how they're used:
Step 1: Once the water is hot, hold the plate against the wall until you see the wall covering darken with moisture around the edges of the plate. Start on a single strip and work from the top down.
Step 2: After about half of the strip has been steamed, lift a top corner with a fingernail or a utility knife and attempt to peel the paper downward. If that doesn't work, resort to a wall scraper. You may have to steam the same areas two or three times to loosen older adhesive behind the paper.