The simple answer, in my opinion, is to start however the hell you want to.
Just make sure to start though.
If you want to be something bad enough, or if you want to do something bad enough, you’ll work up the nerve to start whether you know what you’re doing or not. In fact if I were to lay a bet on it I’d put my money on the majority of success stories not having a clue when they started.
They learned because they tried; they became successful ’cause they kept trying.
Ignorance isn’t an excuse, just fucking do it. If you do it wrong try again.