Maybe I’m just making excuses for not being impervious to fear, but I have a theory that being scared is fine. What is not fine is being so scared that you don’t do anything or that you’re too afraid to start. That’s a big problem.
Being cautious or tentative about something just means you’re alive. Everything we will do has some kind of consequence and we all hate the unknown.
However, the more you summon the courage to face the unknown, the easier becomes. Exercise the "courage-muscle", it comes in handy.