All you need is ignorance and confidence and the success is sure.

Not knowing how hard a thing is can carry you past the point where better informed people would have stopped. Confidence on its own persuades others long before competence shows up, and the two together will take somebody a surprising distance. Both halves of that are true and only one of them is admirable. Expertise brings caution, and caution kills a great many good attempts before they start.

Use the observation in both directions. When you catch yourself deferring to someone purely because they seem certain, check what the certainty rests on. When your own knowledge is talking you out of trying, ask whether the risk is real or merely visible to you.