Starting nursery - your experience, as I am anxious

Hello everyone, 

my little one will be starting nursery on Tuesday. It is bit fast paced as I got offered an interesting job on Friday and I should start in 2 weeks. I am a bit anxious how will she adjust to the new routine, and also how will it work with our breasfeeding, as she still has feeds during the day. And maybe I am more anxious how I will feel about not being there for her, when something happens etc. How did you manage to go through this? Tonight I could not sleep for 2 hours after one of her night feeds as my mind was overthinking it... as usual...