BFH and about 4 hours. Remove the line, the parking brake cable, and the top bolt. pry it open, remove pads and close it. Start wailing on it until it's popped out to the point where it's flush with the rotor. then, open it and pound on it again until it's off. Once off, get a new slide pin, and a ton of caliper slide pin grease.
A wire plumber's brush might also be good to clean up the hole on the caliper itself.
Be sure to soak everything in pb blaster before, during, and after you get it off. It'll help soften the rust, and then you can brush it clean and replace the slide pin.
Had to do this myself on the driver's rear. Took about 4 hours, but I was able to clean up the slide pin and reuse it after some time with a dremel and a polishing bit.
If you're at a point where the pads are shot, and/or the rotor from the pads being shot, you'll have to replace those as well.