9. Bring an expert.
When meeting a stranger, it never hurts to take a spare 225 pounds of muscle with you, but if that muscle knows about what’s being bought, you’re at a huge advantage. Good cop, bad cop can work. You want to buy, but he’s holding you back. If your friend's new boyfriend is a mechanic, definitely bring him along.
10. When it’s time to make a counteroffer to the ludicrous figure listed, be tactful.
Do it in a non-confrontational way: “This is what I’m willing to pay,” not “This is worth ____.” People can get upset about low-ball offers. Sometimes buyers will even try negotiating a little over email at first because the seller might warm to the "lowball" offer once the indignation wears off. Also an email is hardly an inconvenience, so no one should actually be upset about that.