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When you change the pads, simply retract the pistons all the way back intothe caliper. When doing so make sure the bleed nipple is open so you do not pump fluid backwards through the ABS.
It should not take any excessive effort to retract the pistons and they should move smoothly.
As Skid says, clean up the calipers especially the contact points for the new pads. I too use Copperslip.
Also dismantle the slide pins and use brake cleaner to remove old traces of lube. Re-lube with copperslip (it only needs a little). Assemble the carrier without pads and ensure it moves freely on its pins, then fit the pads.
If you have never done so, bleed fresh fluid through each corner (all four). If this is not something you are practiced at, it should only cost about £60 at an independant.
If you find you were experiencing uneven pad wear this could be down to a sticking piston, sticking guide pins, sticking pads (in the carrier) or even excess water/oxygen content in the fluid at one corner (makes the fluid too compressible absorbing some of the transmitted energy).
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