Yes but they are a PITA.
Take out pads first and replace with thin wood and press brake pedal to push out pistons as far as possible. If one doesnt move keep trying, alternatives are *much* harder. Use long piece of wood so you get leverage to waggle it free afterwards.
Unless solid pipe coming out of caliper has been very recently done then it will probably break when you remove it so allow for replacing these. Just bring broken bits to garage and they'll do you some copies. Mine charged 20 quid but this was expensive I think.
There is a how to guide for this that separates the caliper into its two halves. Mine was 'reluctant' and worried about damage to the connecting pipe I did the job without separating it.
Assuming from 'bring back to life' that they are sticking. Even when pushed out as above they are hard to remove. One of those large plumbers wrenches is great for grabbing the end of the piston and twisting it back and forth to help free it.
Once the old seals are out check for corrosion in the recess for the seal. Its impossible to see it without a small mirror though the head of soft nail is good at removing it. If the new seal doesnt sit *perfectly* flat when you put it in its likely you missed a bit. I did and I ended up with a leak and a damaged seal.
Worth replacing front hoses and renew brake fluid at the same time if they are old.
Keep a close eye on brake fluid levels afterwards and check for leak by running finger under short pipe connecting both sides of the caliper.
No idea what it costs at a garage but worth finding out
