This post is a good musing on confidence, but what really caught my eye was comment #6 by Marina of Sufficient Thrust. She relates:
The CEO of GoDaddy, Bob Parsons, explained it best when he shared a story of how he was hesitant to take a leap and his father simply asked him: “Can they eat you?”
If they can’t eat you, do it.
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Thanks for the link love! I can’t take credit for coming up with it, but it is the single-best advice I’ve ever come across.