Before taking a seat, always adjust the position of the chair slightly, whether it is needed or not. Adjusting the chair puts you, in the minds of all present, subconsciously in control of the environment. As a guerrilla you'll be turning the controls over to the buyer as soon as you get started. It's a good idea to do this from the platform of one who is in control. Re-arranging the furniture, even one piece, does this.