If you wish to do fixes on your Honda CB 250 RSD then it will always be recommended to own a Workshop Manual to keep just for a reference in case that you want to know proven methods to remove a specific component such as the Door and fit it again in the correct manner.
Honda CB 250 RSD Workshop Manuals can offer you specified diagnostic facts for the car so if something is faulty it will help you discover what the situation is and some ways to correct it. After that you can evaluate if you can do this on your own or in case the job is just too big you can still make a reservation for your CB 250 RSD right into a trusted mechanic.
Honda CB 250 RSD manual