So what.
My very first outing as a lawyer was to a Court of Appeals (!) hearing and an argument in front of a panel of three judges. I was tongue-tied and the only thing I could have done worse was pee in my pants in the courtroom.
HN's feedback will be ruthless. Your server will melt.
So what.
Revel in the rookie mistakes. You only get to be a rookie once.
For some reason when you launch your app/website you feel that you are putting yourself out there for the rest of the world to judge, and fear being judged and humiliated. Just work through this, launch and get it over with. You will have critics, bad feedback, but you will be one step closer to your goal. Trust me - bad feedback is way better than no feedback
You probably have a ton in there, but you wont know. Better launch early and start fixing everything with your users testing your system.
That way youll not only fix bugs but introduce extra features as well.
You are.
"Won't be able to put out fires effectively enough."
You won't.
So what. Launch. This is your first day at pre-kindergarten. There is a long way to go. And pre-k is fun. Ask anyone who has gone through it.