Step 3: Hang the first strip and smooth out the wallpaper
To begin, lift and lightly adhere one end of the first wallpaper strip to the ceiling. Use a spirit level or the plumb line you drew to make sure it's straight. The top of the strip should be firmly pressed down, and then the top edge should be cut off.
Use the wallpapering tool to smooth the remaining strip, working from top to bottom, middle to bottom, and around the borders. After each strip of wallpaper, wipe the wallpapering tool clean of any remaining adhesive residue.