All private sales are, somewhere along the line, a matter of trust. There are so many ways some folks manage to get around the protections, either as Buyer or as Seller, so it really only comes down to: do you trust the transaction to go smoothly enough..? If yes, go ahead. If no, then desist. Not very helpful, maybe, but that's the nitty-gritty; the rest is unfortunately almost impossible to guarantee. Most sales go off well. Some don't. Some have recourse, others not. There's no perfect, 'cast in stone' solution, so the other party is trusted, or not. Personally, I've never had a deal go sour, but, then again, I do very, very few, and choose partners carefully, so...