There’s a 50% chance of success and failure. Half of what happens depends on what you do, half depends on the gods.
Worry about your 50% and know that the other 50% exists.
Life is half preparation and half chance. You can’t plan for everything becasue the world is in a constant state of flux. Put simply, things will work or they won’t. That’s fine, so long as you remember, the more often you go in to play, the more chance you have of things going your way.