Do you think that negotiation is art?
For me it is! You need to foresee what somedoby think and what does that pearson feels about some issues. Negotiation is not simple and you should get out if it like a winner. You need to have an opinion and techniques of negotiation and also to have you own rules. For me these rules are some of them:

I know what I know, and know what you’re doing.  Sound simple but didnt simple. “Know everything you can about what you’re doing.” My mother give me that advice and she is absolutely right. Follow it.
I have a key, I bealive that is great. But that is not enough. You’ve got to know who has the upper hand and proceed accordingly. Power is not just about calling all the shots, it’s about ability. Sometimes ability is having the discernment to see into a situation and realizing the power isn’t all yours.
You nedd to be a good player! It takes a lot of smarts to play dumb. This is a good way to see how much your negotiating partners don’t know.
Keep balance, if you have knowledge, you know that knowledge is power, so keep as much of it to yourself as possible.
Be consistent!! Trust your instincts. There are a lot of situations that will not be black and white in negotiating, so go with your gut. Combine this with your homework and you’ll be ahead of the game.
Don’t be confined by expectations. There are no exact rules, and sometimes I’ve changed course in the middle of negotiations.
Know your limitations, and know when to say no.
Be patient = that is gold rules. I’ve waited for some deals for decades, and it was worth the wait. But make sure what you’re waiting for is worth it to begin with. To speed up negotiations, be indifferent. That way you’ll find out if the other side is eager to proceed.