I'm not closing this Priest, but I really think what you need is a visual aid. I'm almost sad to say this for some reason, but there are a plethora of Methamphetamine Smoking (Vaporizing) "tutorials". Literally, search Meth or Smoking Meth.
I've never even seen real Methamphetamine outside of Cambodia/Laos and it was in ecstasy-pill form called yaa-baa. But, I've watched plenty of people smoke Meth on Intervention and television and in documentaries. It doesn't look difficult, although I'm sure there's a certain level of finesse involved. All you need to do is heat the substance to the point of vaporization, but not the point of total combustion.
This involves rolling the pipe around to adjust the level of heat, moving the lighter farther and closer etc. It's something that you're going to have to master yourself though!