If you choose to conduct repairs to your BMW R 1200 GS then it is always recommended to possess a Workshop Manual for personal reference in the event that you want to know the best way to remove a certain part such as the Wheel Bearing and install it again properly.
BMW R 1200 GS Workshop Manuals provides exact diagnostic wisdom on your car therefore if something is broken it can help you identify what the problem is and tips to repair it. You can then evaluate if this can be done by yourself or if ever the job is too big you could make a reservation for your R 1200 GS right into a local garage.
BMW R 1200 GS manual