There is a difference between the kind of confidence that allows you to go fast, and the kind where you “fake it ’til you make it.”
I was working on a project with a friend. It involved some server setup and configuration. As I was typing along, he exclaimed “I could never do what you do, and at that speed. You’re so fast!” to which I replied “It only looks fast because I’ve done this many times before.”
Experience (lots of it) generates this kind of confidence, which makes you fast because you’ve already made the usual mistakes before. The “fake it ’til you make it” type of confidence only serves to jumpstart this whole journey.
Both kinds of confidence are important.
Walking from the train station to your hotel in a new country will take some time. Walking back to the train station from your hotel is a breeze.
But you need to reach your hotel first.