If you want to execute adjustments for your Aprilia RXV 55 then it is usually recommended to have a Workshop Manual to keep just for personal reference just in case you need to know techniques to remove a particular part for example Door and match it again effectively.
Aprilia RXV 55 Workshop Manuals gives you targeted diagnostic information on your car so if something is playing up it will help you determine what the issue is and tips to make it better. You will be able to determine if this can be done on your own or if ever the job is too big it is possible to make a booking for your RXV 55 in to a decent friendly mechanic.
Aprilia RXV 55 manual