1)
Gadgetry is probably your enemy. I am a self-diagnosed gadget-addict. I get sweaty palms when I walk into a dive shop because there are tons of gadgets available, and we wantsses the preciouses... It's taken a fair amount of discipline for me to get out of that habit when it comes to diving. So consider it with a heavy heart that I say, "carry as few things with you as possble." Any piece of unnecessary gear you bring (
cameras excluded ) is really just a kelp magnet in disguise.
2)
Don't give in to the dry-suit zealotry. Tons of people dive wet year-round in Monterey, and do so comfortably. Don't get put off Monterey diving because you're afraid of the cold... The Michelin Man is never cold in Monterey bay, and it's not nearly as bad as you think it is! Once you get past the first rush of water into the suit, it's smooth sailing
(relatively speaking).
3)
Give in to the dry-suit zealotry as soon as possible. Yeah... all that stuff I said before? You should dive like that for at least a few months. It builds character, like shoveling snow or walking 10 miles uphill
(both ways!) to school in the winter. After a few months though, that's your public face. Start secretly saving your change for your used car, err, drysuit because once you go dry you'll probably never go back, plus you get the benefit of joining the zealots!
Seriously though, I really want to echo Sarah's point about the snorkel/kelp-crawl. The kelp crawl is a skill that you SHOULD learn IMO. Practicing a crawling beach exit so it's instinctual can be a real life-saver too. I've never been seriously rolled (haven't been to Monastery yet), but I got tipped over and pushed towards some rocks at MacAbee once, and my body knew the fastest way out of the water at that point.