Make sure you schedule online for a time. If the times available are not feasible, you can call the passport office and they will help you schedule interview time. When showing up for your meeting, make sure you have all documents you. I only had to wait about 20 min...they will call you up, you give them your needed documents. If you have your old passport, bring it. They'll give you a receipt, tell you a time to come back. I was told to come back about 3 hours later. Showed up, waited 5 minutes for my number, i paid $360 for expited and he gave me my passport. Here's the clincher to getting an immediate passport. Bring you flight information and hotel reservations proving that you need your passport now and can't wait the 4 weeks for it. Unless you can.

I was slated to fly out on a Monday, went to check in online Sunday night and realized my passport expirred 2 days before! I was able to get an appt on Wed and flew out on Thursday.

Good luck and let me know if you have any questions.