print you stencil on regular printer paper, tape it to the freezerpaper and x-acto knife the stencil out.
place the freezer paper wax side down on your shirt/fabric/whatever and iron. (i can only imagine you want a fairly low setting, just enough to melt the wax)
paint over your stencil, let dry and peel it off.
Amazing! This is exactly what I was going to say except in a more "tutorial like form" but that's exactly what I do in a nutshell.
Just one more thing I'd like to add, though...for the iron just make sure it's on a dry setting (without steam) and iron over it, wait for it to cool, then go back over the parts you think may be trouble spots, you know the spots with lots of detail. If more details are needed or an actual tutorial is wanted, I'll definately explain.