How can you best protect yourself during a negotiation?

Negotiations sometimes demand too much from one person at one time. Chalk lines must therefore be determined in advance if you want to be able to fully focus on the course and not take damage. Emotion and discussion can be confusing circumstances if you haven't captured the essentials for yourself in advance. Also consider a plan B or an exit. Beforehand, come to terms with the fact that you let go of the negotiation altogether.