Firstly, confidence is a transitive property. People feel confident about work they’re receiving when the person delivering it is doing it confidently. They want to know they hired the right person for the job. Makes them feel smart. And they are smart. They hired you, didn’t they. Show them how smart they are.
Small differences in performance can lead to very unequal distributions when repeated over time. This is yet another reason why habits are so important. The people and organizations that can do the right things, more consistently are more likely to maintain a slight edge and accumulate disproportionate rewards over time.