It seems logical to me that if these guys spent years learning how to do their deeds of 9-11, they could have also spent time learning to shoot. There could be other cells in other cities ready to do the same thing.
Hitting a target the size of a small plate at 150 yards is not easy for a "hacker", and add to that the stress that must surely (I wouldn't know it from experience, to tell the truth) exist when shooting something besides paper, and you're outside the 1st deviation.