I'm going to assume you're going guided? with dad? on this moose hunt?

Or is this a solo drew the tag? what state by the way? or canada?

If guided....I wouldn't worry too much, just try your best to be prepared to shoot such an animal, ie know your gun, how to work it, if its too big, try to use something smaller that youre more comfy with. Have fun? Don't get too stressed/worried, listen to the guys with more knowledge than yourself, cept maybe when they tell you to bite that liver....haha.