I've had a method practically since 2013 if I'm not mistaken after months of research which all in all doesn't seem bad to me and I wanted to share it here to get some opinions.
It practically falls into the category of suffocation methods, in my opinion the lethality is close to 100% but it could be a bit annoying but perhaps with some precautions it can be made less painful.
Practically it consists of putting a plastic bag on your head or anything else that somehow leaves you without oxygen after a while of breathing, better if a plastic bag of the kind that doesn't have the characteristic smell because it could make it more annoying; I had also tested with one of those backpacks where you can shrink them to your liking; the important thing is that oxygen cannot enter in any way and therefore that the bag is tight around the neck, for this you need something like a scarf to tie.
At this point you will be wondering how it works given that the accumulation of carbon dioxide gives a feeling of suffocation and therefore one would not resist and would remove the bag after a while, this is where the handcuffs come into play, after having tightened the bag you should handcuff yourself with your hands behind your back to prevent the method from being ruined in any way during the suffocation process, the ideal would be to lie down on the floor perhaps on a blanket and a pillow and then get into position on the side to be more comfortable, I came very close to the moment in which I would have had to close the handcuffs behind my back and therefore no longer have any possibility of second thoughts but precisely because the thing is so extreme I hesitated quite a few times and in fact I am still alive.
I bought the handcuffs at the time on Ebay, I think they are still easily available today, I bought the collectible ones because I was ashamed of taking the BDSM ones even if the latter could be more comfortable, I practically have the ones used by the police, purchased without problems in 2013, perhaps today with Amazon it is even easier.
I have read several times about the symptoms of excess carbon dioxide which is called hypercapnia and the symptoms are not even that terrible but it cannot even be considered a painless method, the ones that make me think most are the sense of panic and the headache, here is a link that explains how hypercapnia works:
https://en.wikipedia.org/wiki/Hypercapnia
I am somewhat reassured by the fact that by increasing the percentage of CO2 we go from a state of activation which could therefore create panic to one of sedation which I imagine is preferable as we move towards loss of consciousness and therefore death given that we continue to breathe that air devoid of oxygen but containing carbon dioxide created by our breathing even while we lost consciousness.
At this point I was thinking about remedies to avoid headache and panic, obviously I thought about benzodiazepines and maybe alcohol for panic, perhaps the former is better than the latter because in my opinion it is better to have an empty stomach, I don't want to be able to vomit, I don't think it's one of the symptoms but it's better to be on the safe side. To avoid headaches, perhaps I can take a painkiller before carrying out the method, perhaps a strong dose.
Let's say that it is a relatively easy method for those who are a little lazy like me to search the deep web for chemicals or who cannot buy a nitrogen cylinder without attracting suspicion in the family. I think that compared to hanging it is a little less painful as a method but maybe the process is longer, obviously I mean hanging by asphyxiation, in the other where one breaks the neck instead causes instant loss of consciousness.
However, it must also be said that a well-done hanging can perhaps be less painful than this method or the Night Night method discussed here might also be interesting, but they are other methods so we won't talk about them here.
I saw that some topics on this method already exist but I didn't see anyone who opened them went into as much detail as I did so I open this anyway hoping it won't be closed.
I was thinking that I could take some opiates to counteract both the feeling of panic and the pain, perhaps opiates and benzodiazepines together, obviously not at the overdose level because you shouldn't die like that. I read that Kurt Cobain was under the influence of diazepam and heroin at the time he shot himself, practically feeling great, but certainly by shooting himself his end came suddenly whereas with this method you have to wait a bit.
If you have any suggestions or constructive criticism of the method feel free to advise.
I'm not very suicidal in the immediate but I think it's good to have a method in the drawer so as to live more peacefully, paradoxically thus keeping suicide itself at bay, who knows.