You’re starting something you’ve never done. It’s making you anxious. You find yourself lacking confidence.

What if I fail? What if I’m laughed at? What if my critics say: “I told you!”

It’s impossible to have 100% confidence when you’re starting something new. 

However, it’s 100% possible to know that you will figure it out.
That you care about your progress more than what people think of you.
That even if you fail, you will own it and make it better.

Confidence that you don’t have confidence as of now but will figure things out is the only confidence you ought to have.