9. Tile. The pace of tile installation is slower than that of wallpaper, and there is a lot of contemplation that goes into a good tile installation. If you aren't experienced, you may discover something you should have thought about when it's too late. You also want to prep correctly. Tiles are all different and require different approaches to installation. Your DIY tile floor may look good when it's done, but can you be sure it will hold up and not crack in a year or two? If you are confident about that, go for it. If not, call a professional.