Going from taking naps to no naps once school starts

I know I have been lucky. DS is 4 and still takes a nap at daycare as well as the weekends when he's home with us. Starting next Tuesday he will start pre-kindergarten. It will be from 9 to 3 so no naps. I am terrified. He is an absolute monster when he doesn't nap. We are that family that tries to revolve everything around his nap. I am scared to death how this change will affect not only him but me and dh as well. Does anyone have any experience with this. I already know I need to get him to bed earlier (7:30 instead of 8) but is there anything else I can help him with the transition?

Going from taking naps to no naps once school starts

I would cut the naps out immediately. No napping on the weekends or during the week. A week should be enough time to work out the transition.