Confidence, I think, is often present in someone who’s curious and a bit fearless. I’m not sure I know or have known anyone who is always sure everything they do or try is going to come together the way they want it to. It’s more that they’re not afraid to try things, and not afraid of failure. When they set their mind to something, or when their curiosity is piqued, they go into action. They abide by a “Why not?” mantra, and little is off-limits to them.
So… three people come to mind– a sister-in-law’s husband, and an uncle of mine on my mother’s side, along with his wife– my aunt, rest her soul.