Some considerations.
1) if you have a stuck piston, you can use compressed air, just put a c-clamp on the piston so it will only move so far and not shoot through your garage window.
2) It is generally a good idea to clean up the cylinder bore ether with a hone attachment for your drill or some crocus to make sure there are no imperfections.
3) Make sure you have a quick source for a replacement piston since you won't know if it's pitted until you have your caliper apart.
Thanks for the DIY, you are right, rebuilding is a lot easier than most people think and a bit more fun than just plug and play!