There is plenty of research material out there for what happens (in people), medical journals, research papers, etc. (these don't tend to be free for the public, I was able to use them because of a research grant on another topic). That is why you have to do the research yourself. The information here is a good jumping off point. Don't let one person sway you one way or the other. For every method look into why it works and how it works. There is NO method that is painless. Be it psychological or physical. Don't jump on the bandwagon and go with the flow. People here are far too eager to go with something or tout against it when a person speaks loud enough or just go with word of mouth without looking things up themselves. Look at the number of the exact same threads that exist when a little search in the search bar could answer their question.
It looks like people have been using SN/SA method prior to the PPH, hell SA/SN are off shoots of sodium cyanide which was used for mass killings (bloody f'ers who forced that on people) and on themselves so they wouldn't get captured. You can use the research on similar compounds as well to see what will happen with others. It won't be exactly the same but it can give you an idea. Yes you will be discolored but there is no body that will not be discolored once you die (blood settling, time spent alone, temp where you are, pets or vermin in area, etc). By the way the blood turns brown, your body turns a light bluish grey.
Yes we don't know what happened once they stopped talking in chat, that is why the research is so important. Once you go unconscious what does it matter? Prep, plan, take precautions. Do what you can.
Your exit is up to you. It is your choice and responsibility. Don't let someone else change it for you. If you fail to prep responsibly from your own research (not just asking people questions because you are too lazy to go look it up yourself) to execution of method then that is on you.
edit:probably won't respond to many if any response to my post. I have 6 days left. Don't need to spend it debating.