Nozzle on an electric drill. It is needed to drill large holes.
Building level with a plumb line.
How to prepare the surface?
After removing the wallpaper, tile or drywall, leveling is performed. The surface is degreased. When removing the old tile with a perforator, small baby can occur, which will fly into the eyes. That not to damage your eyes, and hands, when preparatory work, use special gloves and glasses.