Task: free topic.
Rarely do we think about negotiation before it happens, and the idea that improvisation should be craftily prepared is often omitted. Whether you're appliance salesman, or a teacher at NewTone, or maybe you're just met some friend whom you owe a little - you should be ready.
Be ready to put up a squabble, to answer various questions happy client firing you with, or just to be yourself. All that's required is at hand knowledge and certain skill.
So how can you improve you chances of winning the negotiation? Should it be experience? Or perhaps a bit of luck? Who knows.. the only thing we know for sure is that negotiations are considered to be tricky and it's not a place or time to manifest your coy.