If you wish to perform maintenance tasks on your own Honda NX 250 then it is always a good plan to have a Workshop Manual to keep just for a guide should you want to know tips on how to strip off a specific component much like the Door and match it again in the right way.
Honda NX 250 Workshop Manuals will give you special diagnostic info for your car therefore if something is playing up it will help you determine what the problem is and how you can correct it. You will be able to assess if you can do this yourself or in case the job is too big it is possible to book your NX 250 in to a trusted garage.
Honda NX 250 manual