Watch the youtube video many times so you know what to do. I'd suggest getting some level 55 gear and your Ifrit weapon before you que there. Remember, tanks must always be better geared then everyone else to hold hate and absorb dmg output.
Honestly the best way to learn is to go there as a DPS if you have anyone who would be nice enough to let you tag along. The entire dungeon is full of little bits of knowledge you'll need to know to have your run go smoothly.