If you have to perform maintenance tasks on your BMW F800 ST then it is usually a good plan to possess a Workshop Manual to keep just for a guide if you want to know the way to remove a particular part much like the Clutch and fit it again correctly.
BMW F800 ST Workshop Manuals will give identifiable diagnostic guides with regards to your car so if something is playing up it will help you identify what the problem is and how to repair it. You will be able to determine if this can be achieved by yourself or that the job is just too big you could make a reservation for your F800 ST in to a nearby mechanic.
BMW F800 ST manual