No confidence means no success in sales

The term "insecure salesperson" sounds almost like an oxymoron. Without sufficient self-confidence, you will never be able to succeed in sales and will very soon cease to be a salesperson.

No matter what your field of business is, if you do not believe in yourself, you can never succeed in attracting clients and prospects. What then is the salesperson's way of achieving a self-confident, ambitious self?