Broken interior door mechanism

It's usually more pain than it's worth to try and fix the broken mechanism; most mechanics will just replace the unit. But as far as that goes, you'll have to remove the door panel;which isn't rocket science, but it does take a lot of patience and you generally break a couple of the snaps that hold the panel in place. You can pick more of those up at most auto stores for about $2 a pack. After that ordeal it's just unmounting the mechanism and replacing.