Popcorn ceilings were invented by the devil, no doubt. HATE them.
Electrical: I will do anything electrical up to the connection to the box. I don't f--- with that, but I know how to run outlets and what not. I did have a pro do the wiring for my generator, though.
Plumbing: Like Chad, I will install fixtures, but when it comes to the piping, we're calling the pro in to do the heavy lifting.
Painting: I used to do all my own painting. I like doing it and I like HOW I do it. I take all the outlet covers off, all the fixtures down, all the HVAC controllers, and I PAINT. There are no "circles" or "covered spots" in rooms I've painted. There's no "painting around" things. I have painted virtually EVERY room in every house I've ever owned, except for one (Charlotte, which we bought new). Having said that, I was traveling a lot this past year with my parents, and we finally hired a guy to paint the kids bathroom and one of the bedrooms... and since then he's done the hall, the stairwell, and my kitchen. My painting days are probably over; it's not worth it. The guy does it as his second job, and he's good. Good enough for me! (Not going to lie, though: I HAVE gone around and touched up things so it's the way I would do it!)