Just an FYI is to make sure you make a "contract," tell him you'll give him a copy and keep one with yourself. Bring a buddy along, and sign both your names.
Do it if it's anything over $100.
Make sure you have his real cell phone and real name.
I've done it many times, such as: when i sold my car, i sold a 98+ front conversion to some guy, etc.
That 98+ front sell would've turned out a disaster because the moment the guy came he tried to go against everything i had explained (scratches, small cracks, etc.), then he starts telling me, "oh man you didn't tell me this, how about this much money?"
I literally negotiated with him for 40min. until i told him if he wants it he could take it if not, then sorry for the long drive.
Anyways, signed a contract, and that made it damm sure that he knew what he was getting into, bought exactly as it was explained by me, and absolutely no returns.