>>3768830bad advice.
helium has a chance of popping your lungs if you fuck it up. you will die in unimaginable agony.
making a proper noose takes practice and isn't the kind of thing you can learn on your own. real hangmen had to take apprenticeships from experienced executioners to learn the craft. (fun fact: the method of hanging that causes instant death wasn't invented until 1872:
https://en.wikipedia.org/wiki/Hanging#Long_drop) 0% chance you'll do it right, i guarantee you will slowly suffocate for several minutes while being fully conscious the entire time. would not recommend.
i'd tell you how to do it but /c/posters are my friends and i don't want to kill my friends. please understand.