"I don't like the way that went down because X. Next time I'm going to focus on Y because Z." Everyone fucks up. The trick is to visibly and demonstrably learn from your fuckups.
An expert is a man who has made all the mistakes which can be made, in a narrow field.
Hey, you're a consultant now, aren't you? Technically speaking? You need my consultant joke, which I told every time I met with a contractor or owner because I was young and they were resentful.