I can only speak of the NEO in Odessa.
Dress nice. Jean's and Polo at a minimum.
You'll get a pair of boots the 1st day. Gonna be lace ups. I don't recommend the pairs with the metatarsal flap (you'll understand which ones when you see them). Take some leather/boot conditioner to help with the leather brake in. If you go to Odessa, start wearing those boots to training the next day.
Go clean shaved. If you show up, and Merle sees you unshaven, he'll make you dry shave on the spot.
Basically, it's all safety training. The quizzes/tests are made for a middle school comprehension level. Don't think to hard.
Lunch was provided to us onsite. We were given a $12 voucher to McAllister. Breakfast is on your own.
Being early is being on time.
They put us up in a hotel (we got the Fundome), which was pretty nice. Had a bar with cheap happy hour. Free breakfast. Pretty decent rooms. I got lucky and didn't have a roommate.
For me, the room was technically booked for a month, but I only used it for 8 days. I'm mwd, but the others were pretty much on the cement side, a few mud engineers and some lab techs also.
If you are going to Odessa, and will be working out there, I suggest taking what clothing you may need for work. FRC's and other safety gear will be provided. I would definitely take some warm clothes to wear underneath your FRC, at least until you some insulated frc.