the vid explains everything ^^
no extra tools needed
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*It DOES work with EXISTING toons.
*You only need to make the toon once. After that, you can just log in on the alt prior to every time you want to change the model of any other of your toons.
*Race/*** does not matter when model changing
*Class/Race composition DOES NOT MATTER.
*PERSISTS THROUGH ZONING!
*Any type of model changing such like Noggenfogger, Travel Form, Sheep will cancel the effect.
*Death does NOt reset the model
*Stealth does NOT reset the model
*EQUIPPED gear on the MODEL USED will transfer over to the CHARACTER USED.
EDIT: someone in an other forum created a autoit script to make it easier ^^ (thanks ßlink)