We had a 9:05 ADR on our last trip and were able to enter at 8:50. At the entrance on the left there will be a CM checking ADR times and letting people in for them.
Yep. Just get to the gate early and find a castmember who will direct you where to enter. Bring your camera b/c you can get AWESOME pics of your group on Main St and in front of the castle before the flood gates open. Enjoy!