If you choose to conduct repairs on your own Aprilia RS 250 then it is usually a good plan to have access to a Workshop Manual to keep just for personal reference in case you want to know techniques to remove a particular component for instance the Brake Pads and install it again accordingly.
Aprilia RS 250 Workshop Manuals offers clear exact diagnostic guidelines for your vehicle therefore if something is not working it will help you find out what the issue is and how you can resolve it. You can then analyse if you can do this on your own or in case the job is too big you are able to book your RS 250 in to a suitable repair garage.
Aprilia RS 250 manual