You need that hunger no matter what, because eventually the honeymoon period wears off. Somewhere between printing your business cards that say 'founder' on them and everything else you have to do, you realize, 'Oh, actually this is a ton of work.'

Don't worry about failure; you only have to be right once.

I actually don't think it matters how early or late you are as long as you hit critical mass.

You have to adopt a mindset that says, 'Okay, in three months, I'll need to know all this stuff, and then in six months there's going to be a whole other set of things to know - again in a year, in five years.' The tools will change, the knowledge will change, the worries will change.

You're not going to become a great manager overnight. You're not going to become a great public speaker or figure out how to raise money. These are the things you want to start the clock on as early as possible.

One misconception is that entrepreneurs love risk. Actually, we all want things to go as we expect. What you need is a blind optimism and a tolerance for uncertainty.

If you have a dream, you can spend a lifetime studying, planning, and getting ready for it. What you should be doing is getting started.