If you want to carry out fixes to your Aprilia Pegaso 125 then it is always recommended to own a Workshop Manual to use as a guide in case you want to know tips on how to take off a particular component such as the Wheel and install it again properly.
Aprilia Pegaso 125 Workshop Manuals will give exact diagnostic details with regards to your vehicle so if something is faulty it can help you find out what the situation is and how you can resolve it. After that you can decide if this can be done yourself or in the event the job is too big you could make a reservation for your Pegaso 125 in with a decent mechanic.
Aprilia Pegaso 125 manual