Most of us like to think that because we are an expert in a certain field we can handle our own issues or transactions, whether it be a legal issue for attorneys, medical issues for doctors (I hope they get help), or real estate deals for real estate agents. Sometimes ego gets in the way of reason. I know that may be a revolutionary concept, but its true, it does happen. I know, not to you.
Even if we are in the business, its still a good idea to hire outside help. At least have a colleague represent you or have them close to advise you. Remember, in negotiating its always good to have a higher authority to refer to, if the other side knows you have the final word, they will pressure you to make it.