Having the self-belief that you will be able to figure things out as you go along is critical to success at anything hard.
Get started and trust yourself. No one has all the answers at the beginning.
I meet a lot of people searching for something (career, relationship, etc). And yet, when it’s put in front of them, they won’t pursue it because they fear pain (getting hurt, failure, etc.). So they unconsciously (and expensively) trade self protection for misery.