The back is kind of a pain in the ass unless you get a brake service tool. It looks kind of like a c-clamp that you attach a disk to so you can turn in the rear pistons. The front pistons you can just compress with a c clamp, but the rears have to be turned in.
I got the complete brake service kit at Harbour freight tools for less than $30.00. It came with the clamping tool and a large assortment of disks for diffeent cars. I have used the little cube you can get from the auto parts store and attach to a socket wrench and they suck. The points on the cube just don't fit well enough and you get no clamping action with them. The brake service kit is well worth the money.