i do mine often but they the pins are well and truly stuck this time. I can push the pistons in and the pads move freely but the pins are stuck fast! i shall be doing mine later this week.
so the boiling water "theory" seems to work. You use robuck rb2/spanner in a can/wd40 the night/day before on the pins, push the pistons in free the pads, taking pressure off the pins, use a brake cleaner. Pore boiling water over the calliper/pins and let magic happen. in that the calliper expands quicker than the pins due to the differing material and the pins move earlier.
then don't mess about give them a hit in! and a good whack out!
fingers crossed it works.
if not cut the pins as you have mrpinks ones and drill them out if they still won't come out.