For example, instead of a paper knife — scissors.

And you can glue the wallpaper yourself and use a home tool for this, instead of professional. For example, instead of a paper knife — scissors.

If you approach the repair from the financial plan, then spend the most money on paint, because you need materials for leveling walls, paint itself. For such money, you can buy expensive washing wallpaper. But still if you make painting in a room with even walls, then a little money to spend on the paint.