I've been doing DL NYE for 27 or so years now. If you want to be in DL that night, get in early and stay there. Don't leave the park. I have seen to many guest at the gates saying, but I have a hand stamp. That wont help if they are at capacity and aren't allowed to let more people in.
The place is packed and its hard to move in the evening/night time. Try not to move from one side of the park to the other. Its easier to stay in one area. The running back and forth with FP wont be easy.
After midnight the park empty but still is open till 2:00am(usually) That is a great time to get on rides. We have done it a few times and its a blast.