I started out in the trade in 1975 working for an alarm company. We installed alarms, burg. and fire and hold up stuff. Liked the work but hated my boss. Quit that job and went to work for an electrical contractor. We did everything, res., com., ind., etc. I learned a lot, however my old boss was not too keen on the code. To my advantage he made me look up the codes when ever we had to do something different. It was good for me but bad for him. He never stuck his nose in the code book after getting his lic. He made me do it. I worked for him for more than 8 years and I left at $7 per hour in 1984. I got my own lic. and went on my own.
P.S. My brother worked for my boss, but when I got my own lic. my boss fired my brother.