One thing about trading hot days on the roof. Imagine a hot kitchen in the middle of summer, ovens, friers, grills, etc. Those kitchens get pretty darn hot. Now add the greasy floors you will be crawling on, it can get messy. Find some cardboard boxes to lay on the floors while you are working.
Again, I don't want to discourage you, just give you some things to think about. Much luck in your new endeavour.