If you choose to undertake fixes on your Ducati 125 Scrambler then it will always be a good plan to have access to a Workshop Manual to keep just for reference in the event you want to know proven methods to take out a certain component much like the Gearbox and match it again in the correct manner.
Ducati 125 Scrambler Workshop Manuals gives you particular diagnostic information with regards to your car or truck so if something is not working it can help you identify what the situation is and how you can correct it. Then you are able to evaluate if you can do this on your own or in case the job is just too big you could book your 125 Scrambler into a trusted garage.
Ducati 125 Scrambler manual