Hey taroom, the best advise I can give is look professional and be friendly anything else you've heard forget it. Be yourself! And don't give up, I know of plenty of people that went to multiple interviews untill they got in with all airlines. I have a few friends that are about to train to do the requruitment, I think their training is the day before they see you so if I hear anything worth your knowledge I'll give you guys a heads up.
Don't forget, have fun on the day and make friends, exchange details with some that get thru, it helps to go in to training with a few friends already.
Good luck