If you choose to do fixes to your KTM 620 LSE then it is always recommended to own a Workshop Manual to use as a guide just in case you need to know simple methods to remove a particular component for example, the Door and match it again accurately.
KTM 620 LSE Workshop Manuals can offer you detailed diagnostic guidelines with regards to your automobile so if something is wrong it can help you discover what the issue is and how to repair it. After that you can analyse if this can be achieved yourself or if the job is simply too big you could book your 620 LSE into a trusted mechanic.
KTM 620 LSE manual