check the DIY section tab on the top of these pages on this site for a photo/text description on how to do the brake job. Mercedes discs get replaced not turned - they are priced accordingly.

rear discs can be a bit tricky to remove due to the parking brake, learn how to relaease the rear parking brake through the tiny holes in the rear hubs.

I am curious about the wheel bearings, however? do a search on recommended intervals, or ask your dealer what the recommended repacking of the bearings are.