6. When in doubt, do the opposite of what a salesperson would do.
Most folk view salespeople with suspicion. As a result, doing anything that smacks of professional selling (e.g. slick patter, glad-handing, constantly trying to close) creates distrust and distance. Paradoxical as it seems, the most effective way to sell is to stop "selling" and instead figure out how to add value to the other person's life.