You will do just fine! The first day is always the hardest.
I remember after I graduated nursing school and was on the bus on my way to my first real job as a graduate nurse. The closer we got to the hospital the more sick I felt and by the time we got there I nearly refused to get off the bus and instead go all the way around back home again.
Thankfully I had been talking to the bus driver on the way and he knew how nervous I was and kicked me off the bus at the hospital!
It wasn't as bad as I imagined it would be. Everyone knew that I was new and were very kind and helpful.
Now I'm facing that fear again for September because that is when I'm supposed to be starting a back to work program. I've been off work for over 4 years and while I'm excited, I'm also a bundle of nerves.
So trust me. You will do absolutely fine. Getting up and out the door is 1/2 the battle.
Good luck tomorrow