When I spill a few drops of paint on the floor, I immediately cover the droplets with some pieces of masking tape. This prevents me from stepping into the paint five minutes later and then walking it all over my house and into the carpet. It’s a simple trick, but very effective. I discovered it myself.
I have quite a few other tips because I’m painting our house and I’m doing it the agile way. I might call it Agile Painting, or Painting 3.0.