I might as well pipe in. I started out as a burg/fire alarm installer back in 1974-1975. Then I worked for an EC here in NJ for 8 years or so, got my state NJ lic. 7257. Went in my own business for 15 years. ( 1984-1999 ) I had at the peak of my career 7 employees and 4 trucks. We did Res. and com. work. Mostly maintenc jobs. We worked for a lot of schools, rest., bus, and some GC contractors. The trouble with maintence work is that they want you now. NOT later but NOW! I lost many Sat., Sun., and Holidays, trying to get things to work. (When the supply house was closed!)
I got my electrical inspectors lic. ( here in NJ it is ICS, HHS, sub code offical and construction offical ) lic. in 1995. I am now a working AHJ here in NJ since 1998. I work for 4 different towns at the moment.