If you wish to perform fixes to your Beta REV 4T then it is usually recommended to own a Workshop Manual for personal reference just in case you need to know the best way to take off a particular component including Door and install it again in the right way.
Beta REV 4T Workshop Manuals will give you detailed diagnostic guidelines on your automobile so if something is faulty it helps you understand what the problem is and how you can resolve it. Then you are able to assess if this can be done on your own or that the job is too big you can actually book your REV 4T in to a trusted car garage.
Beta REV 4T manual