There really is no such thing as a simple household project.

[The Velveteen Ocelot]

2. Projects breed more projects.

When you strip wallpaper you discover that the wall underneath needs patching. When you remove carpeting you find that the floor needs refinishing. You change some pictures around and you have to get something to patch the nail holes with, and when you put up different pictures they don't cover all of the patched nail holes so you have to buy more paint to cover the patches and you hope it matches the existing paint because if it doesn't you'll have to repaint the whole wall, which means you also have to get tape, dropcloths and brushes. No matter what the project, it always happens that you discover that you don't have the right materials or tools and you have to go to the hardware store. Again.