If you work for someone, that is part of what you are getting paid for. If you work for yourself, it is the only way you can become successful. Self-Confidence comes from successfully completing increasingly difficult tasks and assignments. Give your maximum to every project, no matter how insignificant or formidable. Success does not come from working hard.
Success comes from playing hard.
Therefore, if you want success, you must position yourself so that the duties that you perform, no matter how difficult or challenging, are considered play to you and not work. If you do this, not only will you gain success, but you will have fun doing it. Cohen's Maxims are summarized here, but to understand them fully, the book should be read. You are encouraged to e-mail comments on this topic to support constructive conversation. Your suggestions on additional topics are welcome.