There is a difference between worry and preparedness. You cannot be fully prepared for anything. So do your best to prepare and mitigate your risks, but then move on. Consider the risks and then live your life.

Successful people are quick to make a decision and slow to change their minds. (They get results and feedback before making new decisions.) Unsuccessful people never get traction because they are slow to make a decision and then quick to change their minds (often based on emotions).