You shouldn't force your 10 year old son to wear a diaper but tell him that he will feel much better by not having to wake up in a wet bed.
It can be embarrassing for him to have you put a diaper on him at 10 years old. You can put it on him at first and tell him after that he can do it himself.
Another thing that you could do is get some pampers underjams or goodnites that he can easily pull on and off himself.
If you do use diapers on him I recommend not trying to get him to wear baby diapers with the prints as that may make him feel worse.
You can buy youth attends disposable diaper online that are plain white diapers and will fit him.
He might be more apt to wear the plain white ones but might not want to wear a baby diaper such as pampers or huggies even though they might fit.
As for changing a 10 year old's diaper you do it the same as a you did when he was a baby although he's bigger now and he might put up a bigger fight now at 10 years old.