If you are nose below level and applying hard elevators, don't apply rapid rudder or aleiron input. This applies at low to medium speeds. That is what causes you to stall one wing before the other and send you into a spin. If you do really need the quick and hard rudder or aleiron input, ease up a bit on the elevators first. Nose above level, this scenerio is not a problem.
The quickest recovery is done by pushing forward on the stick, and throttling back the engine on the outside of the spin briefly until the rotation is countered. Use rudder to fine tune your counter rotation if needed. (Key commands are shift+1=Select engine one, shift+2=select engine two, shift+e=select all engines. I have these functions mapped to my throttle unit, but when I only had a flight stick, it was still possible for me to key the commands with the keyboard and recover within 2K feet.)
Bozons recovery instructions are effective in pretty much any plane, however using asemetrical power is very effective specificly to the P38, and will help you recover with much less altitude loss. Depending on the severity of the spin, you may lose up to 4-6K feet trying to recover using standard methods.
There are dozens of P-38 films to be found by following the link in my sig.