Alright, so I'm going to make an exit bag with helium. I just have a few questions before I go through with this shit. First, exactly how much helium does it take to kill me? For example, let's say I set up everything(tube connected to tank and in bag, bag on head, etc). When I want to start the process, how much should I open the valve? Will I be able to gauge how much is coming out without worrying about running out of helium? Also, how loud are these things? Will it make a loud SSSSSSSSS noise when I open the valve?