Hello friend, these repairs are simple, I say simple, when you only have to replace the parts such as the bendix, the brushes or carbons and the solenoid, because when it comes to the rotor or stator, this is more complicated, you have to check with the tester to determine an internal short circuit in these pieces or if they are grounded, but hey, you don't have to be afraid of these repairs, I think that for you it is something routine, I am still in the learning process, greetings.