If you choose to undertake repairs to your Buell Lightning XB9S then it is usually recommended to have a Workshop Manual for personal reference in case you need to know easy methods to take off a particular part much like the Clutch and fit it again in the correct way.
Buell Lightning XB9S Workshop Manuals can provide distinct diagnostic information on your car so if something is faulty it helps you understand what the situation is and the best way to correct it. Then you are able to determine if this can be done on your own or that the job is simply too big you can actually book your Lightning XB9S in with a trusted mechanic.
Buell Lightning XB9S manual