Anyone wishing a complete version should see the Join page for further information. Nothing turns talented and successful professionals into quivering masses of insecurity more quickly than the very idea, let alone the practice, of negotiation. Perhaps they're daunted by quantifying their self-worth to a potential buyer or they perceive themselves as lacking bargaining skills. But those skills can be learned.
Negotiation is really an art grounded in science.
Artists do it every day, although they take it so much for granted they're often unaware they're doing it. Think about the last time you challenged a phone company customer service representative over a bill. Whether you applied sugar or vinegar, you evaluated the person you were dealing with and chose a course of action. Some methods work better than others, but it is the desired result that counts. Some pros are quite good at it.