Know what you're signing up for. This is not a 9–5 job. You're going to work your ass off, day in and day out.
Be humble, be teachable, and never stop learning. The pay is great, but don't let it own you.
Be ready for hard but rewarding work.
Most of all, it's more than a job, it's a brotherhood. You'll depend on your crew with your life, and they'll depend on you.
That bond is one of the best parts of the trade.