Everybody negotiates. Avoid these three negotiating mistakes. We negotiate the big stuff, like salaries and contracts, and we negotiate the little stuff, curfews and who will do the dishes. From my years as an entrepreneur and my coach training, I’ve honed my negotiating skills.  I’m not supposed to make negotiating mistakes, but it happened to me recently. In the end, even though I got what I wanted, the whole process left me feeling that I was in the wrong. My…