If you want to negotiate the best deal for yourself going into a job, do as I say, not as I do.
When the Free Press asked me whether I wanted a job, I immediately yelled, “Yes!”
Not very cool, I know.
And I quickly slammed any door I had for negotiating. Fortunately, I was treated pretty well anyway. Now, I tell people (even people I make offers to) not to accept instantly.
A little about the dynamics of hiring: Between the time when a company offers you a job and you accept, you have leverage.
Inside the company, a bunch of people have met and decided that you are the person, out of a handful of candidates, whom they want to hire. The person who makes the call is expected to get your acceptance. They do not want to reconvene, go to the next candidate or re-ignite their search.