Ever found yourself in endless research about what to do about a certain decision?
Looking for books, articles, previous experience from others?
Obviously, you don't want to be naive and learn from others. On the other side, you are looking for confidence to give yourself the permission to make a decision.
However, there is no single moment that exactly repeats itself. So even though there might be patterns, you will never know 100% of the outcome, so don't wait for the confidence.
When making decisions, try to come from a place of curiosity not fear. I mean, in most situations you not gonna lose anything. Taking the wrong job? Well, quit and apply for the other one again (or do it while remaining in the position). The key again is coming out of curiosity and making a decision and learning from it.
If you take it as learning and finding out if that's what you wanted, will help you instead coming out of fear. Just keep in mind a) you don't need to stick with that decision necessarily and b) no one knows if it was the "right" decisions. I mean, are you in a parallel universe where you can see how the other way would have turned out?
Man, that would be great, or would it? Anyway, you don't have it. So there is no right and wrong per se - just learning and improving. And that's fine. Don't beat yourself up too much and enjoy it.