The only thing I would like to add is that prior to removal of the caliper, use an 8" c-clamp to compress the pistons by squeezing the whole caliper against the old rotor. Take them all the way in. You risk no damage to the piston boots doing it this way (versus uninstalled) and the big c-clamp makes it go like butter ( and won't leave the gouge marks that c-channel pliers can ). Depending on the level of your brake fluid, you may overfill it once you start moving the pistons back in so keep an eye on it and remove fluid as necessary. Otherwise, front brakes are a breeze.
1982 Mercedes-Benz 300CD
1982 Mercedes-Benz 240D - stick