As walls and corners aren't often straight, don't rely on them as a guide when you hang paper. However, the Unix world doesn't have an equivalent term, so perhaps wallpaper will take hold there. Do the same for all the walls in the room, then add the square footage numbers together to get the room's total square footage. Wallpaper removal can be messy, so we always take precautions to cover floors, counters, appliances, and any exposed areas. Wallpaper is a great way to create a big impact in both small spaces and large rooms. Need further instructions? If necessary, cut the first length in half vertically along the edge that'll overlap the corner. Also, it's best to work away from the window, so the paper edges don't cast a shadow if they overlap slightly. You can navigate this site in several ways. Check out our other guides to hanging wallpaper.