I think that's the single best piece of advice: constantly think about how you could be doing things better and questioning yourself.
You're going to pay a price for every bloody thing you do and everything you don't do. You don't get to choose to not pay a price. You get to choose which poison you're going to take. That's it.
Every step you take in the wild is a step towards understanding yourself better.
Don't let fear stop you from doing what you want to do.