Must be willing to starve for a few years until you build a client base. Be willing to be called a wuss if you get sick or hurt, be willing to be at the bottom of the toilet until you find a few customers that haven't already been working with other seasoned salesman. Be willing to have customers or jobs taken from you if your client works with other builders that work with other salesman. Unless you have a good manager be willing to be called a turd or lazy because you haven't gotten enough sales even though you have run your vehicle in the ground. Be willing to admit that there are builders out there that are loyal to the competition and be willing to sell them anything you can to get your foot in the door!