Sage advice:
Speak only when spoken to.
Do not question what you are told to do, just do it to the best of your ability and as quickly as you can.
Keep in mind:
When you think you've hit the edge, you haven't.
After RFTD (Recruit Field Training Division) or what ever it's called today, things get easier.
Good Luck! Have fun and remember, you get out of it what you put into it. Come back in 16 weeks and tell us you Graduated in Blue as a rifle expert and with a 300 PFT Score.
Semper Fi,
Mark