In this tutorial, we are shown how to prep your walls for wallpaper, which is very easy! Preparing your walls only takes a few minutes and makes applying the wallpaper easier and look a lot better. You will need: rags, soapy water, wallpaper stripping knife, and sandpaper to do this. First, you need to apply the soapy water to the current wallpaper and then take it off with the stripping knife. Once it's all removed, you need to repair any holes in the wall. Next, sand down the surface of the wall to make it smooth. Then, you will use a paintbrush to paint the paste for the new wallpaper onto the wall!