You have to anticipate and embrace the inevitable sensation of fear. You will feel fear for sure. And you will feel risk. None of those daydreams where you imagine yourself in a movie of your own success, just happen without that zone and period of risk and terror. (Edward Norton, on his entrepreneurship facet)
Don’t expect you will stop being afraid. On your career, every move has its own risk. You have to learn to deal with it, the sooner, the better. Turn your fear into fuel, and keep on working.