Or, if you pre-ordered at Gamestop like I did, it's best you get it as soon as you can. They have a 48 hour hold no matter if you preordered it first or not (mainly because the game is so much in demand, their lists are tragically long, so you'll have to compensate by getting there by due date). So unless you can't get it as soon as they got it, you just tell them and they'll hold it for you longer. Other than that, it's first come, first serve. But, you'll have a good 99.9% chance of getting it the quickest by preordering.