Re: Those of who change own tires.....
I picked up a big ol' tire changer from America's Tire Company for $200. *It's pneumatic powered and awesome.
Made my own static balancer with some 2X4s and 1/2' bar stock. *Cost me $5 or so.
CBRSHO, if you have the right equipment, and removing your own wheels is a pretty easy task for you, changing your tires should not be too bad. What you need to realize is there is a tremendous amount of force involved in changing tires, both in de-mounting and mounting, as well as breaking and seating the beads. If you make an error and apply the force at the wrong time, in the wrong direction, or apply too much force, bad things can happen.
I watched at the guys who were changing my tires at the tire shops, and decided that I was just as capable as they were, and probably a little bit smarter. So, I got the equipment, asked a lot of advice and went for it. I've long since lost count of how many tires I've changed, and never had a problem.