You guys are gonna love Terri. She should be there, and she's so much fun. And if Gloria joins her, you guys will be in great hands. They're both so easy to work with, and they want nothing more than for you to succeed. You've made it this far, and they are just here to guide you through the next step in the process -- which is easier than you think. Read through the NY PEPC thread to get an idea for what it was like for us.
And if you haven't started the e-QIP, DO IT AS SOON AS YOU GET THE LINK! We had two on our PEPC day that had to fill it out on-site... I started my PEPC at 8AM, the same time as one of the guys started his e-QIP, and when I was done with my entire PEPC day, he was still working on it. It takes an incredibly long time to complete, and you won't have the internet to search for any information you don't know from memory (addresses and phone numbers of places you've worked in the last 7 years).
And on the day of your PEPC, RELAX! Remember, it's the government. They're here to help you. And this time, they actually do.
Oh, and don't smoke pot. It'll probably show up on the drug test.