I once helped a blind friend do some updating of her wiring, she needed more outlets in the basement. I made sure power was out & told her which wires were which colors and explained how to do it, I've rewired more than one house (My mom's place, we almost tripled the breakers in the place, it quit popping the breaker when you turned the lights on in the garage and had the kitchen lights on + anything in the master bathroom... 1 breaker per circuit and 12 Ga. wire instead of 16 Ga and suddenly things got LOTS better.) Passed the code test in suburbia there nicely. It "may" help that I've been studying electronics since the 60s
Also have fixed an idiot I know's issues in plumbing - You don't want to just (over and over despite being told how bad it is!) use just whatever random scrap of pipe you have, so that water supply like runs Iron, Copper, Plastic, Iron, Copper, Iron, Plastic, Iron, Plastic, Copper, Iron pieces in 20 feet of run, you want it all the SAME material. Prevents problems like galvanic corrosion (where the Iron and Copper act as a battery & corrode causing leaks...)
It's all been in books & Now's definitely on the web, do look for the "Gotchas" same as in any technology.