It might be important to keep in mind that there is a large difference between negotiating to buy a car and negotiating to work some place. A lot of the stuff you read seems to be geared toward "buying a car" -- used top 10 tricks, outsmart somehow the dealer, maybe act like an asshole a bit, and you're leaving and never seeing them again. I don't see it always working too well in job negotiations. Approaching it tha…
One where it is a one off deal and you will probably never work with the person again.
The other is where you are entering into a business arrangement that requires ongoing cooperation.
The same techniques cannot be applied to both. Unfortunately a lot of negotiation advice doesn't specify which situation it is better applied to but it's worth keeping in mind.