A nice easy question for those who have done GUE-F: what skills would you recommend I practice beforehand to get the most out of the course?
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It is very, very useful to have a proficient backwards kick and helicopter turn before DIR-F.
Valve drills, S-drills, Kicks. All while staying perfectly flat and keeping your knees up.
2. If possible, dive with the people you will be doing the course with, learn how they dive and try to improve communication (both with hand signals and with a light if you're going for a tech pass). If you dive together enough, you might learn to anticipate them.
3. Before each dive nominate a leader, positions and responsibilities and keep to it. Rotate these responsibilities so that everyone gets used to being both a chief and an indian.