If you can trust yourself when all men doubt you, But make allowance for their doubting too;

When you go out on your own, you'll be challenged on a lot of things. Can you do this, is your idea even viable, will you be the right person to grow the company? Lots of folks will question you. But if you have the mettle, and the facts to back you up, then you can succeed.

Lots of facts are out there, a lot of analysts will give you ideas and predictions. Take them for what they are guesses. No one knows what the future will bring. But entrepreneurs are the only ones who can go out there, and bring their vision to reality. That is creating the future, not predicting it. The folks who are guessing can doubt, but the ones who are making it real have no reason to question.

You will get a lot of naysayers against you. Don't listen to them.

But understand where their doubts come from. Learn why it didn't work 5, 10, 15 years ago. What the conditions were back then, and the solutions to those problems were addressed back then.

Ignore the nonconstructive doubts. It does nothing other than burn calories.