New balance shoes are issued to you...? that's kind of awesome. I last visited a little less than a year ago on a cross country and it was very far from the OCS I knew, the Old Nimitz hall was a field of grass, SUYA and cookie jar gone from what i could tell; and the uniforms and conduct in the mess hall seemed much more relaxed. I'm sure the Di's have their methods to create the same training regardless.
I wouldn't rap yourself around too much prior, my closest friend to this day was the last person i would have ever expected when we were filling out paper work the very first day. I'd just arrange a meet up prior if it makes sense the night before so there is a few familiar faces day one, other than that, the training takes care of its self. If you have a will and a way; you will improvise, adapt, and overcome. -Cheers