There are three main steps to this crossover move, The First step is to take a Long Outside Step to get the defender to jump out of the way

Now that the defender has bit on that Outside Step Keep that leg locked and loaded to spring off of.

Now Use the Crossover Dribble but keep in below the knees so the defender can't swipe at it and hit it away, Then blow by the defender these are the three main simple steps to Allen Iverson's Crossover.