Get one of your mates to give you a ring on the mobile at the same time you are showing the guy round.
Always flushes out the tyre kickers and "give us a drive mister", just make an appointment for your mate to view, after the other 3 or 4 people have been to see the car, Just make sure your near him so he can hear you.
Never hurts to let them see you've had a lot of interest, another reason why you cant come down much on the price.
Best of luck.
:thubsup: