I'm not into the SN method, I don't think it's very peaceful. With the gas method, it's technical setting up a gas cylinder with a flow regulator. I'm not a scientist, I have no idea when it comes to something like that. So yeah, setting up all the different pieces of equipment to get the correct flow of air, and then making sure you've sourced/made the correct thing to put over your head. It's not straightforward getting all of that equipment and working out how it fits together, especially if you don't like alone...
However, even SN you have to source a bunch of drugs and follow a regimen. Not my cup of tea.