Basically, IMO, if they take it for a test drive you go with them. If you don't like their driving, tell them and if they crash it, they pay for it.... If they refuse, go to the police and take them to court.... Sure there are a lot of A#%EHOLES out there that like to make it hard but i don't think you'll have any troubles there man.... good luck with the sale...
Cheers,
Dave.