Death in chair gas

[SadCryingBunny]

I have made arm restraints in my gaming chair. The second restraint will be via my long flat nylon bungee so I can slide my hand through it unless you got recommendations. I want to kill myself with nitrogen and exit bag. I do not want to survive. Please give me any tips. The chair is a SecretLab. So very very heavy and stable and will add a 20kg tank to the base. I am just trying to gain the courage. I have also made a light slice in my neck. I'm going to end up fucking my mum up mentally for the rest of her life, but she deserves it for abusing me as well as my dad. I'll be found dead and autopsied. I hope there is no afterlife and it's just black.