I've had my own place for more years than I care to remember and find it takes a certain attitude to to the job.
I mainly do old classics with about 20% modern stuff mixed in. The variation between resto, repaints, crash repairs, welding, panel fab etc suits me.
I don't bother with staff anymore as I've struggle in the past to find reliable folk who don't want to earn more than me but can't be arsed to do the job how I like it done. When I had good ones they go on to something else and I have to tran again
Great job satisfaction IMO and I rarely find it tedious where others do.
My son is 19 and he can't rub down a whole panel without getting bored and the standard dropping, or just going to play golf in one of the fields
I couldn't work somewhere that I couldn't do a bit of everything, but you need to learn each process properly before you can string them all together
Plenty of good advice so far, check out some places and get a bit of a trial on Saturdays or holidays, you'll soon decide if you like it