Practitioners of the Zen philosophy have something to teach those of us who are not, something that is helpful to the process of negotiation.
The most difficult part of negotiation for most people is keeping your cool in the face of the pressure to succeed, the pressure tactics used by others, resulting anger, and often the knowledge that a negotiation table is not a familiar place. Finding your Zen space can help enormously and, with reasonable practice, this can come naturally.
Practice in advance getting into Your Zen Space. You will be seeking awareness stripped of those obscuring layers imposed by mindless thoughts, self-referent attachments and dogmas. You will be seeking to view reality, as it is, a "mindful" state.
At first, use a quiet room, away from distractions, with neutral decorations. Get some non-disturbing music playing, whatever relaxes you. Sit in a comfortable chair. Close your eyes. Take three deep breaths, focusing your thoughts on your inhales and exhales. Review your thoughts and then discard them. Focus only on what it feels, sounds and looks like in this state. Imagine yourself watching yourself from outside.
This state is not sleep, but neither is it the hyper-alert, stirring state of mind when we are awake.
Practice this process often, in conditions that increasingly less isolated, so you can eventually get here wherever you are. You have found your Zen space, where you can think and interact without interference from your fears, biases and presuppositions.