My confidence comes from 5 years of Systems Analysis. It's hard work, but we do get answers. If you don't know the answers then that confidence can look like optimism.

Here is a challenge for you (It requires that we rise above the nature of people, to nature itself):

https://eric-bott.medium.com/i-will-try-to-make-this-easy-for-you-all-you-need-to-do-is-answer-yes-no-to-each-question-f00180bceff4