If you wish to do auto repairs for your Honda CBR125R then it is usually recommended to possess a Workshop Manual to use as a guide should you need to know the best way to take off a particular component including Brake Pads and install it again correctly.
Honda CBR125R Workshop Manuals are able to offer exact diagnostic guidelines on your car so if something is faulty it helps you find out what the problem is and tips to fix it. Then you are able to analyse if this can be done yourself or if the job is too big you could make a reservation for your CBR125R in with a trusted repair garage.
Honda CBR125R manual