It seems to me that confidence is the vehicle that takes us to those places we aspire to be. Like a vehicle, it has to maintained and fueled properly!
Maintenance requires checking off all the components.... discipline, focus, organization, resilience ....all the things that maintain a HIGH level of confidence.
Fueling confidence, is a matter of accomplishment, gained experience and networking with like minded people!
When developed properly ... there is NOTHING that true confidence can't achieve!