People gauge a person’s personality and trustworthiness on body language and on how a person talks and listens, especially professional salespersons. Even the most open-minded persons will quickly size up a person by the way that person sits, fidgets or deosn't fidget, their handshake, their smile, and many other types of body language.

They will next determine whether they like, trust, or will follow someone’s lead by the way that person speaks. Proper speaking skills for salespersons include using the proper tone, attitude, words, and stopping to speak and listen.