I've never taught this before, but I would say to look at the rate of turn indicator to determine the direction of the spin, then apply the usual recovery technique...neutralize ailerons, opposite rudder, and releasing the backpressure. As soon as you break the stall (airspeed indicator shows an increase in speed), level the wings using the turn coordinator and bring the pitch to level using the airspeed indicator, VSI, and altimeter. At no time should you reference the attitude indicator or heading indicator.
Just curious, is this an instrument rated pilot or basic private pilot? There's nothing wrong with learning this, but I'm not sure it has any practical, real world value. If he's only a private pilot, I would say it's much more important to learn basic attitude control so they never get disoriented enough to get close to a spin. If he's an instrument rated pilot, the only reason I can think of that would put you in to a spin would be an icing encounter...and if you're flying a 172 around in icing, I would say there are some decisionmaking skills to look at. By the time a plane spins because of icing, the instrument pilot is probably in *way* over their head and knowing how to recover from a spin isn't going to save them.
