It's been years since I thought of Batfink, an animated superhero I watched on T.V. as a kid. He had super-sonic sonar radar and metallic wings. I was mesmerized by his confidence as he tackled villains, proclaiming "Your bullets cannot harm me. My wings are like a shield of steel!"
You need confidence the most when upholding your values and beliefs or convincing someone to take action. Selling my book to publishers is a good test; they may not like my views or take action.
Just like Batfink, who carried a can of oil to keep his wings polished, the mind-set of confidence needs to be tended and maintained. Whether by positive self-talk or celebrating small wins, you need to keep your engine running on high. For example, I just found out that my "The Adventures of a First-time Author" presentation was selected to be featured on SlideShare's home page (and received more than 1,000 views). I am pumped because this is my first on-line acknowledgement.
If confidence is like a shield of steel, then a small win now and again helps keep it shining.