This is often said “Confidence comes from mastery. Mastery comes from repetition. Repetition comes from discipline.”
Having said that, discipline is actually the hardest thing to achieve. There are several factors at play to distract one from staying disciplined. If discipline was the peak, it’s a very pointy peak and all sides around it are a slippery slope pulling you back to the ground.
If one wants to latch onto something to stay at the peak of discipline, that is the freedom one can get from Organizing. While the process of organizing itself can make people anxious, once achieved, it gives all the freedom possible to bend and break the rules within the scope of staying in the disciplined realm.