If you wish to execute fixes for your KTM 250 SX then it is usually a good idea to own a Workshop Manual to use as a guide if you need to know easy methods to strip off a specific component such as the Brake Pads and install it again in the correct manner.
KTM 250 SX Workshop Manuals are able to offer precise diagnostic facts for your vehicle so if something is playing up it can help you determine what the problem is and methods to make it better. You will be able to assess if this can be done on your own or if ever the job is just too big you can actually make a booking for your 250 SX right into a suitable mechanic.
KTM 250 SX manual