What do the scriptures say on how to calm oneself down when one is faced with exiting his comfort zone? As long as I can remember, I've always became quite nervous with uncomfortable feelings whenever it was time to leave my comfort zone behind and jump into the cold. Unfortunately it affects my thinking process, my appetite, and my behaviours in general. I hate being a nervous wreck and I'd rather be calm when the storm hits.
What advice can Jewish sources give me on that particular issue?