I've learned a few valuable things here on my first day.
1. When delivering a baby, WEAR A MASK, or at least goggles. Trust me. You are in DIRECT firing line for LOTS of fluids. So be prepared.
2. Try and have your husband come and visit you on call and give you a backrub. Or at least bring you delicious fish tacos with peach mango salsa from home. They will make your first call night loads better.
3. Babies are quite slippery when they come out. It's considered poor form to drop them. (Thankfully I didn't learn this one the hard way.)
It's been quite fun so far, though, with two deliveries under my belt. No real calls yet, so I've just been trying to read and remember all the things I forgot during my fourth year about obstetrics. And enjoy the nice LCD flat screen TV in the call room.