I don't plan on diving altitude often but with family in ABQ, NM I'm sure I'll eventually end up at the Blue Hole.
So other then reading the 20 pages in the adventure manual, acclimating to 5000' while in NM, doing extra slow ascents (as always) and setting my dive computer to the correct mode..... is there really anything else I need to know for a single dive?
That depends upon whether you do the course with me or with someone who will just give you the very minimum basics.