We have moved so many times and have painted SOOOO many walls!
I know lots of people tape, but i actually hate tape. I always feel like one of two things happens: 1) you pull it off too soon before everything is dry, and then it leaves an edge that's not that smooth, or 2) you let it dry and then the paint sticks to it and pulls off, leaving an edge that's not smooth. I've even had a professional painter use tape, and the tape bits are STILL on our wall because they literally got stuck in the paint and he couldn't get it off! Oy!
Instead, I just edge carefully and keep a damp (not wet) paper towel on hand to wipe any small drips. Once you get the hang of the technique of edging, it really is super easy to edge without taping. For me the key is how you load the paint on the brush.
* Use an angled 2" brush
* dip about 1" of the brush tip into the paint.
* then, using the edge of the can or paint container, scrape all of the excess paint off of the side that will not be touching the wall.
* You may also need to scrape the very edge tip of the brush, leaving paint only on the side of the brush that will touch the wall.
* Then for actually starting to edge, i start slightly away from the crease, and build my way in. i'm not really sure how to explain this, but it prevents a big paint glob from accumulating in the crease.
Whatever you decide to do, good luck!!! Painting is a chore, for sure, but it's so satisfying when it's done and everything feels fresh!