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.
Love this speech by Bill Gurley - one of the common things across top professionals like Bob Dylan, Danny Meyer, etc was that they studied everything they could find about their field, they were masterful students first.
Finding Purpose in Tech Careers: The Explorer, the Journeyman, and the Healer