I would make a backup of all of the modules of your car, for safe keeping. Take things slow, & read a lot of info on what you are about to do. You can usually go in to several different layers of setup menus, before you get a warning. 1st learn to do some different levels of diagnostics, learning your way around the software. It will take you quite sometime to think you have the software figured out, but it was written by German engineers!