Oh wow I never considered that possibility of one's metabolism breaking the N down too fast

That sounds terrible. Hopefully, you're right about a high enough overdose being enough to counteract that possibility. That's the scary kind of failure that makes me consider a secondary back-up to the N such as drowning after losing consciousness. Ideally, I'd like to purchase and down 4 bottles of N, way more than enough to kill a single person.
I'd hope my SI wouldn't kick in though after drinking it since I will have had more than enough time to reconsider my options to CBT and the N itself would have a sedating effect which I'd hope would actually lower my SI rapidly after it's effects begin to take hold. I don't plan on fighting it, that's for sure. After I drink, I want the whole process to be over with as quick and painlessly as possible. I'd like to flood my brain with as many comforts as possible without thinking about death in my final moments before lights out. I imagine if I'm still conscious after chugging, I'll put on a Youtube video I like to distract myself and drift off while keeping my mind distracted on the video.
Do you have any experience going under full anesthesia before? Personally, I haven't, but I wish I had something like that for reference. I just have to trust the words of others who have went under the knife and came back to tell the tale untraumatized.