I second, or third, getting your certification done prior to your trip. It's much nicer to be able to just dive and enjoy yourself rather than worrying about performing some of the required skills. The other thing is that the more dives you do the more comfortable you become underwater. This always helps with your buoyancy and your breathing. Both are important to enjoyable dives.
Don't let cold water dissuade you from diving. Like it's been stated, after diving cold water, especially if you dive with a dry suit, the warmer waters are heaven and yes are much much easier to dive. Good luck and always remember to take pictures to share.
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