first, thank god you don't have drum brakes... a can of brake cleaner does work best for cleaning, yank the 2 bolts out, take a look at how thin the pad is to the metal backing, as a worst case, I have a set of '88 1100 floaters that will bolt on.
Yeh, whizz em off first and then take the pads out. Make sure that all pistons move OK and chuck on some braided lines if you haven't already got some on. The originals will be dead by now !
Get some brake cleaner and give them a good scrub until they look like new.
If and pistons aren't moving strip them down and clean them up.
NOTE - If you pump the lever when the caliper if off the disk be careful not to go mad else the pistion WILL POP OUT and will be a twat to get back in.
Be careful when working with brakes. Get someone who's done it before, that you trust, to help you the first time.
Remember if you get it wrong it hurts !!!!!