I'm on my 5th year as a 'Lone Ranger' here.

how do i sum it up? well i guess it depends if you subscribe to the service call end of things , the contractual arena, or a combination.....

If service work is your game, then a stocked truck, pager & box of scooby snacks (with appologies to E-Scott) is all you need, and off you go....this is the 'kibbles & bits' end of the trade, not as lucrative, yet less a gamble due to the diversity of customer base.

Should you wish to try your hand at making GC's happy then find yourself 2 or 3 good ones , but prepare to blow off the serv calls proportional to what you take on here.
This can be the land of crap shooters, win big, loose big. Time constraints are always going to be a juggeling act, one must always think ahead for parts, plans, payments, etc.

In either case, know your resources....