Confidence comes from having at least some of the answers. Competent people are confident. Competent people face fearful situations with confidence. Incompetent people, which is how I feel much of the time, have to fall back on courage. Raw courage is when there's nothing you can do, and you can't run away, and you stick it out anyway.
Competence is much better.
I recommend it. Or at least, I would like to recommend it. I'm still working on it. But you see the distinction. Courage and confidence are what most people run on.