Producing hydrogen sulfide at home - how dangerous is it?
On the question as to how dangerous is H2S let me detail some facts that I find problematic. Here is a good paper. 

I summarize some of my findings:

First, H2S after initial exposure can deaden your sense of smell (10-minute exposure at 50-100 ppm impairs the sense of smell). So, one may not really have an accurate conception of the magnitude of one's time exposure to the gas.

Second, skin exposure may be a path to ingestion, especially if moist I suspect. Note, some sources actually disagreed on skin exposure poisoning of Hydrogen sulfide with one study alluring to skin toxicosis from high concentrations over a long period. 

Third, following a significant exposure event, the very fact that you are still alive should not be comforting. People having incurred a lethal dose may be a de facto walking dead with a slow hourly progression to death.

Fourth, the ppm considered fatal for H2S is not that far removed from some known very toxic gases (like HCN). However, my opening reference doubts if one can even assign accurate figures on ingestion via the lungs. Here is an extract addressing dosing level ranges:


  Findings in the canary, cat, dog, goat, guinea pig, rabbit and rat (2) are consistent as to the effects of hydrogen sulfide: at 150-225 mg/m3 signs of local irritation of eyes and throat after many hours of exposure; at 300-400 mg/m3 eye and mucous membrane irritation in 1 hour and slight general effects with longer exposure; at 750-1000 mg/m3 slight systemic symptoms in less than 1 hour and possible death after several hours; at 1350 mg/m3 grave systemic effects within 30 minutes and death in less than 1 hour; at 2250 mg/m3 collapse and death within 15-30 minutes, and at 2700 mg/m3 immediate collapse, respiratory paralysis and death. 


Viewing all these together, if one has a choice to avoid working or experimenting with the gas, I would do so.