See what he does when you tell him you're going to sleep on it. If that makes it look like a great deal is going to disappear, or if he doesn't want to get lost

See what he does when you tell him you're going to sleep on it. If that makes it look like a great deal is going to disappear, or if he doesn't want to get lost when you tell him you've had enough of him for now, you are being taken for a ride and it's time to get off - what he doesn't want is you getting a chance to compare notes, whether with someone else or yourself. That said, the hard part is realizing it's time to say you're going to sleep on it in the first place. They don't call it a confidence trick for nothing, and faced with someone who's very good at it, it's easy to want to buy what he's selling because the guy's just so dang likeable.