It really will be ok. I know that it may not seem like that to you but it will.
I am pretty sure most people had this when their kids start nursery.
My daughter certainly did when she started. My husband takes her to nursery on his bike so the tears would start once she is on the bycicle with her little helmet on, she would wave to me good bye with tears streaming down her face. It was just horrible to watch.
And then when they got to the nursery she would cry saying she didn't want DH to go and DH found it very distressing.
She goes two days per week and this went on for I think good 6 weeks and then one day it just stopped and she is absolutely loving it now.
I think it was very important that the staff in the nursery are very loving and cuddly and she got lots of cuddles and attention from them when she was dropped off.
And I don't want to sound patronising, you of course know this, but you know it is fine for them to feel upset sometimes, it is all part of growing up and learing how to deal with separation of one way or another. And getting cross with you for leaving her is ok too. I mean it is crap for you but in the long run it is part of growing up.
It is the beginnig of one looooooong guilt trip for you as a parent.
Honestly, if you are happy with the nursery and you know that they are doing what they can to make the transition easier, it really will be fine.
I am sure you will be able to post in a few weeks when she toddles in there with a big grin on her face!