If you want to perform auto repairs for your BMW F800S then it will always be recommended to own a Workshop Manual to keep just for reference in case that you need to know simple methods to take out a specific component for example Dashboard and install it again successfully.
BMW F800S Workshop Manuals provide you with specified diagnostic guidelines on your car therefore if something is not working it helps you find out what the problem is and methods to make it better. After that you can evaluate if you can do this yourself or that the job is just too big it is possible to make a reservation for your F800S into a nearby repair garage.
BMW F800S manual