Cover electrical outlets on the wall with painter’s tape. Turn off the power to the room as an extra precaution.
Place a drop cloth or plastic adhesive against the wall, being sure to cover the baseboards.
Create a web of tiny holes in the wallpaper with a scoring tool. Go over the wall with the tool several times in slow, methodical, circular motions. The more holes, the better; the holes create a passageway to the adhesive.
Adjust the sprayer so it emits a soft, gentle spray rather than a hard stream. In addition to reducing drips, a gentle spray allows you to cover the wall more completely.
Fill the spray bottle three-quarters full with hot water, then top off the other one-quarter with either white vinegar or liquid fabric softener. Gently shake the bottle to combine the elements.
Thoroughly spray the wall with the solution, covering every square inch. Let the solution soak through the scoring holes for 30 minutes.
Remove the wallpaper, working in small sections, with a putty knife. Find an end piece or a seam to the wallpaper, gently insert the knife underneath, and lift the paper with your other hand.
Clean the walls and remove any excess adhesive by mixing a 50-50 solution of mild dish soap and warm water, and wash the walls with a soft sponge. Run your hand over the wall and carefully inspect the wall in a bright light. Even tiny pieces of leftover adhesive can mar the finish you plan next for the wall.
Let the wall thoroughly dry before you proceed with your project. It should be bone dry before you begin to prime or paint it.