Well, no. Here come the times, when you're not able to be a sole warrior. One man is simply not as creative, or has as much knowledge as his/her friends combined in negotiations. Are you selling a house? You don't have an agent? Good luck! Remember that you may not have enough data about the industry. You may not have enough connections. Some negotiations are so much complex that you'll simply not be able to perform well without an ally.
And now my little thoughts from the class - I really love to work individually. It is difficult, yes, but gives much more satisfaction. But sometimes there are times, when I'm not prepared enough. What's then? My team members are my salvation. What's the catch? Conflicts. Unfortunately, I don't have much experience about that, as mostly we had "instant" agreements within a group. But I wish I were in a very complex, very difficult situations and I made many mistakes. Why? To learn and remember. I wish you all some difficult experiences, so you can grow stronger.
Happy thanksgiving!