Unhook the springs from the pads so they just hang in there. I seem to remember that there is also a clip that pokes through the holes of both pins and that also needs to come out. Then the pins should slide out easily. If you need a better description, let me know and I'll post up some pics for you.
The fronts, I think, are the same but they are different from the rears. Which ones are you doing?
--Wag--