Yup, been there, done that, last month...I had a harder time dropping off dd#2 at the day care center than I did with dd#1 (2nd one was only 3 mos. when she started, whereas older one was 7 mos.). I was trying to be strong and put a good face on for both kids (of course, dh had a morning meeting so was no help that day...). I was completely calm and upbeat, until I got to the door of the day care center, then I burst into tears.
Yes, it gets "easier" in that you get used to the mechanics of dropping your kids off--and yes, if you trust your care giver and can form bonds with other parents there, it will be "easier," too, but leaving them behind is probably the hardest thing I have to do every day. And yes, I do like my work--I just wish it could all be different.
I'm close enough that I go over and nurse my girl at lunch time--one less bottle she has to have, and I get concentrated play time with her without my older one needing attention. The folks at the center just see me as part of the family--they've actually started saving desserts for me now!
Good luck with settling in, and remember that for every time you leave them, there is that wonderful moment when you walk in the room and they light up and run over to you. Makes every day worthwhile...