I really like this post. It definitely speaks to me. I also like the fact that you're embracing your fear and posting it on HN for all to see. It's great to see you take action.

Being a perfectionist, I sometimes stop for fear of criticism and more importantly, failure. I literally have a chat with myself in my head. I need to tell myself that it's good enough and that if it fails, I can fix it or move on.

Perhaps it is this that the idea of the Lean Startup has also piqued my interest. It is both horrifying and exhilarating to fail fast. Unfortunately for me, unlike you, I have yet to take action.