I keep a spreadsheet with every outlet/light in every room on it and their corresponding breakers. Much easier since breakers often span multiple rooms, sometimes only powering one or two fixtures in each.

I hook a cheap webcam up to a USB battery pack and load it up on my phone. Then I plug in a light and point the camera at that. It makes it a single trip and doesn’t bother the neighbors.

Great comment, though I disagree with

Electric and water generally* pretty are easy. Don’t mess with the gas lines.

I’ve done all three in multiple houses now, and I’d say that water and gas are pretty easy. Electrical is where you can get yourself in real trouble.

If you screw up water or gas you’re going to know it. The tiniest gas leak smells noticeably even in larger spaces. Water leaks usually become evident once you turn the water on. If you inspect your work afterwards you’ll find it.

Electrical is another story. You can turn on the circuit and everything works and you think you’re good, but you’ve somehow switched the hot and neutral, which is dangerous. Or you used 14 gauge wire on a 20 amp circuit, which will be fine until you put a huge AC unit on that circuit and start a fire inside your walls. I’m not suggesting you shouldn’t do your own electrical, because once you know the basics you’re going to be fine, but as far as dangerous conditions go electrical is the one I worry most about.

just like Brexit, the vote is final.

Brexit was a non-binding proposition, but right wingers didn’t actually care what the people wanted.