Surf around the No-Mar website, good videos and you can pick up some good ideas about changing your tires.
My tire changing equipment has "evolved" over the years but they can be a one stop shop if you want to drop the coin. I change about 5-6 tires a year (plus I usually end up changing out a few for friends) and I save about $50 a tire in purchase price and labor.
If you live around St Louis, No Mar tire shop does not charge for mounting and balancing (off the bike), and their tires are reasonably priced.
http://www.nomartirechanger.com/