A Negotiator Values Good Advice
Advice is cheap. No matter the cost, it can be extremely valuable to a negotiator!
Before sitting down to negotiate anything of substance it is worthwhile to conduct a little research about the person with whom you will be meeting. Seeking the advice of others is part of the due diligence aspect of negotiation preparation. How you handle that advice marks the difference between an impressionable novice and a veteran negotiator.
The negotiator's job is to qualify and verify the advice received. Often information is biased or flawed and can be misleading. Remember, the information passed along has been filtered by the other person and may be biased based on their experience. The task is to validate input garnered from numerous sources. If this information is deemed pertinent to the task at hand, mentally file it away to use when appropriate. If something is learned that is disturbing, seek collaborative input. Never trust a single source even if that person is respected. If they lost a fight or were embarrassed by the outcome, they are more likely to 'bend' reality to their liking than to relay the facts of the situation dispassionately.
Seek out advice by asking peers about their past experiences with the person or company, asking other people who have negotiated with them, or even asking their assistants or co-workers about them. Often one's hobbies reflect on the type of negotiator they are apt to be. A sailor, as contrasted to a power boat owner, is likely to be much more process oriented while the power boater will be focused on the end result.
Solicit input from as many sources as possible and distill it to salient impressions. Then, when actually meeting the other person, during the initial getting-acquainted conversation, observe and validate if the impressions seem to fit.
Train yourself to be observant and reflective to fully develop your negotiating skills.