If you choose to carry out auto repairs on your own Gilera NGR 250 then it is usually a great idea to have access to a Workshop Manual to keep just for reference in the event you need to know methods to strip off a particular component much like the Brake Pads and fit it again correctly.
Gilera NGR 250 Workshop Manuals can provide particular diagnostic wisdom for the vehicle so if something is wrong it can help you work out what the issue is and the way to fix it. You can then evaluate if this can be done on your own or if the job is simply too big you are able to make a booking for your NGR 250 in to a decent mechanic.
Gilera NGR 250 manual