One of the reasons I have succeeded in this competitive business is I have consistently documented my success with written and video testimonials. Leveraging the Law of Social Proof is essential to persuade customers to say YES. I first learned about it when working with Tony Robbins and he interviewed Dr. Robert Cialdini back in ’89. He introduced 6 tools of persuasion to me in his book INFLUENCE and they have made a difference. Here is a great video synopsis of them.