This is really cool and doesn't look too difficult. What makes it poisonous? The lead soldering? I imagine it'd be fine with a respirator
I love stained glass and have always wondered how it's done
It's very precise and takes a huge amount of labour, but I think I can do it in a way that I don't think I could make a good-looking sculpture or oil painting. Cutting the glass seems like it will be my skill barrier more than setting it.
You've got the lead soldering, those lead H-tubes, finely ground glass, and the flux that you lay before soldering. I'm comfortable doing it with a respirator and gloves at least.
I imagine it'd be fine with a respirator
I've been watching a few more vids and he doesn't use a repirator and puts the burning torch right next to his laptop that he's hauling stuff over. 
I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy:
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