One very important factor to consider when teaching the incipient spin recovery is that up until now the student has only been taught the standard stall recovery. A technique which is ingrained in them.
The decision of when to apply full power must be taught to the student as some students attempt to recover from the incipient spin - after the first turn - using full power! - this is even after being shown.
The effect of power in the spin is to pitch the nose of the AC up and is detrimental to the recovery characteristics of most aircraft. The Aircraft Manual should be consulted for all types before spinning is attempted.