I have come to learn a lot of things since purchasing a house: energy costs money, when things break you have to fix them, cereal is an acceptable substitute for a meal when you live alone, etc. However, since the previous owners were the ones who built the place 50 some years ago, and their tastes in decoration did not change during that time, I have become most familiar with painting walls.
I do not paint walls well. However, I have come to the conclusion that taping off areas of wall/border/whatnot is not only not very helpful, but a waste of time. I had some friends help me paint one of the rooms and we had one person dedicated to taping off areas with the blue painter’s tape (which is expensive). Not only is taping difficult, but it didn’t completely prevent paint from getting on the areas in question. We only discovered the paint had seeped into wrong places after we removed the tape and the paint had a chance to dry.
I think the time saved not taping outweighs the accidents of spills. I am not a crazy homeowner. I understand that people are going to spill things on my carpet, walk with nasty bare feet that have not seen soap, and drop Cool Ranch Doritos deep down into the fibers of my house’s being. I put drop clothes down when I paint. If paint gets on the carpet somehow, I wipe it up the best I can. If paint gets on the wrong part of the wall, I wipe it up the best I can. In every instance, it has not been worth the extra 50% of time it takes to tape an area. The only time it may help is on corners when two painted walls meet. However, I have found that using a small craft size brush eliminates the need for tape; it does require some patience and confidence in your anti-shaking skills, but I prefer it.