1. Not building for myself. 2. Not addressing a universal consumer market. 3. Extrapolating too far and pivoting unnecessarily. 4. Not focusing on the bare m

1. Not building for myself. 2. Not addressing a universal consumer market. 3. Extrapolating too far and pivoting unnecessarily. 4. Not focusing on the bare minimum of features. 5. Not keeping things simple. 6. Not having a big "Fordian" vision (read Ford's autobiography). 7. Not getting prospective customers to cover development cost. 8. Focusing too much on "talking about culture" rather than culture itself which is values plus action. 9. Not pushing employees enough. 10. Not insisting on timeliness (being "before time" not "on time") or outcomes enough. 11. Worrying. 12. Not working a fixed 8 hours a day (max 40 hours per week). 13. Not exercising consistently. Needless to say in spite of these, the outcome so far has been good, but if I were to advise someone, I would mention the above.