Again, from Adam Savage on Great Tools, Great Projects, and Great Lessons, at about 1h12m:
When I finally got to Industrial Light & Magic in 1998, into their model shop on episodes one and two and Space Cowboys, I found an incredible group of peers and teachers and friends and there still was not a single build in the five years I spent in that model shop where I didn’t feel at some point someone was going to come up, tap me on the shoulder and tell me the relief pitcher’s coming out because I clearly have no idea what I’m doing and it’s time to go home.
And at a certain point at ILM I was like, “Man, I’m in Valhalla. I’m in the place where every model maker in the world wants to end up here and I am good enough to get here. Why do I still have so much judgment every time I screw something up?” Then I realize, “Well, that’s part of my process. It’s part of the process. Clearly it’s going to happen no matter how technically competent I get. So I’m just going to push past it.” And on Tested, that day that I finished feeling so crappy, I came in the next day. We filmed again for a day and I got the part right. Then I turned to the camera and I explained all of that…
We’re all flawed. To be honest, confronting that, confronting the limits of one’s ability to be perfect, that is tough…
It’s still very difficult for me to confront the fact that I’m a flawed human being. There’s still some part of me that thinks, “Oh, as long as I perform all these things correctly, everything will go smoothly.” The answer is, no. That’s fiction. Nothing will ever go smoothly. No plan ever survives first contact with implementation and we’re all going to screw up and feel unworthy at a very constant pace in our lives. That’s being a person. The trick is to be honest about that.