They say your first day is always your hardest. Whoever "they" are, they're full of shit. My first day was wonderful. I made my boss look like an ass, and went home with a smile on my face. No, the hardest day was about a year and a half later. I was a resident, and a damn good one to boot. I'd been having a rather rough day, it happens to the best of us, and I went to my mentor for help.