If you wish to perform repairs for your Beta RR 250M then it is usually a good plan to have access to a Workshop Manual to use as a guide just in case you want to know proven methods to remove a certain component like the Door and install it again appropriately.
Beta RR 250M Workshop Manuals provides detailed diagnostic details for the car so if something is broken it helps you work out what the problem is and methods to repair it. Then you are able to evaluate if this can be done on your own or if the job is simply too big you can book your RR 250M into a nearby friendly mechanic.
Beta RR 250M manual