Q: Tim, it’s a very long story, and don’t think I’m crazy. I’m building a new home and wondering if I can install all the electrical wiring myself. It’s not a big home, but it’s got all the things going on you’d normally have in a home, including quite a few three- and four-way switches. I’ve watched a bunch of online videos, I’ve read a few authoritative books and I’m feeling pretty confident. What am I missing? What would you do if you were me?

Margo F.

Albany, Ga.

A: Margo’s in an interesting predicament. My guess is this is a financial issue where she’s trying...