Cut the wallpaper into horizontal strips using the utility knife to score the paper surface in straight lines of about one foot apart. Take care not to cut too deeply and score the wall beneath the paper.
Connect the extension hose to your Scunci steamer, and place the flat rectangular upholstery nozzle onto the end of the hose. Slip the round coupling on the end of the hose onto the steamer nozzle, and slip the upholstery nozzle onto the coupling at the other end of the hose.
Open the water stop located at the top of the steamer, and fill it with water to the maximum capacity line. Screw the water stop back into place.
Plug the steamer into an electric socket, and turn it on. Wait 10 to 15 minutes for the steamer to heat up. Usable temperature is reached when steam begins to escape from the nozzle.
Hold the steamer by the handle, and point it towards the floor at a 45-degree angle. Place the upholstery nozzle against the wallpaper, and press the activator button on the steamer. Move the steamer across the surface of the wallpaper in a horizontal line, starting at the highest point of the wallpaper and working your way downwards. Saturate the wallpaper with steam until the wallpaper darkens from the moisture.
After wetting down one of the horizontal cut panels with steam, peel the wallpaper slowly from the surface of the wall. The steam should have unbounded the adhesive sufficiently to allow the paper to pull easily away. Use the blade of the paper stripper to help pry up wallpaper that does not peel away. Make a second run with the steamer if the first does not loosen the adhesive enough.