Volvo C70 rear brake pads

Volvo C70 mk 2 2006 - changing rear brake pads.
The last time I changed brake pads was about 40 years ago on my MGB, and things seem more complicated now.
I've got the wheel and caliper off, but I apparently need a brake caliper rewind tool - on order, and I'll collect it tomorrow.
Can folks please confirm that I can't just push the caliper back with a G clamp?
Also, I tried putting fine nosed pliers in the two holes and turning those, but there's absolutely no movement whatsoever. Is it really meant to be that hard to turn?
Finally, I released the handbrake before starting. Is there an adjustment on the handbrake that I have to slacken off before I retract the caliper? I'm reluctant to pull the gaiter off from the handbrake because it's a bit elderly and looks like it will split. So, I won't try unless I have to.
Thanks.
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On 04/08/2018 16:06, GB wrote:

I have seen a youtube video of someone doing that on an Astra H rear caliper. The trick is to apply pressure with a clamp and at the same time rotate the piston.
Some cars need a pair of rewind tools becuse each side is handed.
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