This is all good advice. I was nervous too, but it's honestly not that bad. Just focus on what you can control. For instance, I would consider the following items essential: 1) broken-in Bates Lites, 2) 2 pairs of woodland cammies, 3) small, sharp scissors, 4) 6" ruler, 5) gallon-size ziploc bags, 6) decent BOOT SOCKS (throw the trash they give you away), 7) good running socks that stop at the ankles and contain no cotton (again, throw the trash they give you away), 8) NEW running shoes (Asics Gel-Kayano are my favs), 9) BODYGLIDE for your feet.
I agree with the other posts that the PT is fairly strenous, but for most of the time you're there, you're done with the hard PT by 7am. Then it's mostly walking to the classrooms and to chow. Speaking of which, STAY AWAY FROM THE CAKE!! You should be looking forward to training. Too many candidates I knew looked forward to the chow instead, and the cake was a big reason. You'll see what I mean when you get there. SF>