Two lessons:
1. Get a coach who acts like a coach in a sport, asks tough questions that you may wish to avoid, and talks you through those lonely moments when you have a problem that can't be shared with stakeholders.

As a coach myself, I keep practicing and adding deep questions to my tools more than tricks and secrets to show off.

2. Watch your labor costs weekly. Unless you make nuclear reactors, that one line on the income statement has the most controllable impact.