You will remember your time in training vividly for the rest of your life.
Hang in there. They will break you down before they build you up.
Be honorable. There will always be some tool who tries to screw everyone over.
Be patient. You will do some of the stupidest crap you can imagine in the name of discipline.
Good luck. It is only the beginning.
(My own memories are as an AF-OT 20-some years ago. Still remember the first day.)