I think you would get a lot of your questions answered by working in a studio before you open your own.

That would help you decide if you really want to go for it.

If you are good with people - kids that WON'T smile (or worse), fussy and prima donna brides and their mothers, etc, that will help!

How about setting up some 'information interviews' with some photographers? Ask what the joys and hassles are - and you might get a position in one.

Being a receptionist would be great - you get to know all the customers and all the situations!

Good luck!