I too have a soft boy!
Harry has been going to a private nursery for the past few years, although he is still very clingy with me. For example, he has cried every day I dropped him off this past week - yet, the week before he was perfectly happy to walk in on his own.
Harry will be starting the school nursery on Monday, so a new place, new people, new children. I took him last week for a few hours and he loved it - got stuck straight in with all the toys and children etc - this made me feel better about him going there because I was anxious with him being very emotional and clingy.
Harry will go to the school nursery for mornings, and then the private nursery will pick him up at lunch time and take him back there for the afternoon. Harry being soft is the main driving reason for me sending him to the school nursery for mornings because i'm hoping it'll soften the blow of him starting school if he starts with some of the same children he's been playing with for the past year.
I'm sure your son will be fine. He may be upset at first when you leave, but will soon get stuck in - and they will call you if he continues to be upset. If you're concerned, give them a call about half hour after you've left him there... this is what I've done before, and he's always been fine.
