The goalie should always be the loudest player on the field because he is the leader of the defense.  Without a good net minder even a good team will go no where.  This video sumarizes the importance of the Five Step Arc that should be intuitive for every goalie.

Being in the right position is obviously important, but just as important are good mechanics.  This video goes over the best stance to have in net as well as the fundamentals of stepping to the ball, and how to make those tough off hip saves that haunt even the best goalies.