I don't like using C clamps on multi piston set ups. You push one in, another one comes out. The quick and easy way to do it is to open the bleeder screw, but make sure you have a hose on the end. Put the hose into a bottle and pry back on the old pad. You'll notice that the pistons on the calipers will go back alot quicker. After the pistons are set all the way back, let the bleeder line stay open until a steady stream of fluid starts to come out. Close the bleeder screw. if you want to, you can reuse the fluid. I would recommend buying new DOT 4 brake fluid being that over time constant braking can contribute to moisture in the lines, which leads to softer brake pedal feel, which ultimately leads to longer stops. After the pistons are all the way back, then go ahead and take the clips off the retainer pins and replace the pads. I hope this helps.
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