Confidence
vs. wishful thinking...?
I'd say that after 20 hours of fishing with the same equipment and the same spots..."Bod" and "angler C" will have the same chance at catching fish!
Confidence may increase your attention on your line which increases your chance of setting the hook properly...
It may makes you cast better with better presentation and retrieve...
It may also makes you fish longer...
But I doubt the fish care if you're confident or not!
Fishing is not like golf where the game is mostly in your head!!!