I love test screenings. Some directors don't, I know. But I love it. I think it's because I come from the theatre and in the theatre, previews are where you really have to listen to the audience and really feel how they're responding. I found our test screenings incredibly useful.
Do not look for approval except for the consciousness of doing your best.
I never understood the idea that you're supposed to mellow as you get older. Slowing down isn't something I relate to at all. The goal is to continue in good and bad, all of it.