“Except in very narrow cases, where there's breakthrough science that needs patent production, worrying about competitors is a waste of time. If you can't out iterate someone who is trying to copy you, you're toast anyway.”
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Start-ups make so many mistakes that the challenge to identify the root cause of a failure is tough. But believing in your own plan is probably the worst.
There was a study done in the early 20th century of all the entrepreneurs who entered the automobile industry around the same time as Henry Ford there were something like 500 automotive companies that got funded, had the internal combustion engine, had the technology, and had the vision. Sixty percent of them folded within a couple of years.
Customers don't know what they want. There's plenty of good psychology research that shows that people are not able to accurately predict how they would behave in the future. So asking them, 'Would you buy my product if it had these three features?' or 'How would you react if we changed our product this way?' is a waste of time. They don't know.
Our educational system is not preparing people for the 21st Century. Failure is an essential part of entrepreneurship. If you work hard, you can get an 'A' pretty much guaranteed, but in entrepreneurship, that's not how it works.