Am I more likely to succeed by reading this book and participating more directly in my negotiations, or by spending more time on my work and hiring a lawyer with a reputation for understanding these negotiations?
I don't think hiring a good lawyer and understanding these things are mutually exclusive.
IMO, you will be much more successful and less screwed by understanding how it works and participating directly in your negotiations while working with a good lawyer.
Whether this book helps in understanding or not I don't know since I haven't read it, yet.
