Hi
Theres no way you can apply that method to a model with normal hair

try erasing inbetween hairstrands...
For the body you use the path tool (with a feather radius of maybe 1 pixel when you do the mask or cut out) - for the hair either channels or the extract tool(or you can use Knockout 2, the plugin).
No small task my friend. My guess is, Youll have to look at atleast a couple of tutorials to have the fortune to apply it excactly to your two images...
But hey - good luck!
BR Orisinal