So you never actually compress the piston until the caliper is off? That's where I was confused, I thought you said there was some way to compress the brake piston with the caliper still on the rotor.
As for sliding the caliper back and forth I'll give that a try. Last time I was putting some decent muscle into pushing outwards. Darn thing wouldn't budge though. Does it usually take quite a bit of power to pull off the caliper when it's having this problem? I've just always learned that power is very seldom the answer when doing anything. I don't want to risk breaking anything.
Thanks again for everyones help!