What should I do to prepare walls for wallpapering?

To prepare your walls for wallpapering, start by removing old wallpaper and cleaning the surface of any debris or stains. Patch holes or cracks with filler, then sand smooth for an even base. Remove switch plates and outlet covers for a cleaner application. Apply a primer specifically for wallpaper to enhance adhesion and ease future removal. Accurately measure and mark vertical guidelines with a level to ensure the wall wallpaper hangs straight. Gather necessary tools, including adhesive, brushes, a smoothing tool, and a sharp knife for precise cutting. Proper preparation ensures a smooth installation and stunning results with your new wallpaper for walls.