I thought a thread (especially for newcomers) offering some very simple cautions might be useful.
This thread isn't about what you should DO, it's about what you should AVOID.
Again and again I see the same questions, and (sadly) the same failures. While there are undoubtedly exceptions to these "rules," they are rare, and not to be relied upon if you want a successful suicide. If you want to argue, "but I heard about this one time when..." first ask yourself if that "one time" was a reliable technique or a stroke of luck.
Therefore:
DO NOT attempt to OD on any drug containing paracetamol/acetaminophen: it will destroy your liver and leave you in agony before it comes close to killing you.
DO NOT attempt to shoot yourself by aiming at your temple: you will only destroy your frontal lobe and become a vegetable.
DO NOT attempt to shoot yourself by aiming under up your chin: again, you will only destroy your frontal lobe and become a vegetable.
DO NOT attempt hanging with any rope/strap/belt you are not confident (e.g. have tested) will support your full weight: breakage is a common cause of failure to ctb.
DO NOT attempt to ctb with N without first knowing/understanding/using an anti-emetic protocol: you will quite likely puke out the N and fail to ctb --expensively.
DO NOT attempt to shoot yourself with any gun smaller than .38 Special (revolver) or 9mm (semi-auto): smaller calibers are not powerful enough to reliably penetrate your skull and destroy your brainstem.
DO NOT attempt to ctb with SN without first knowing/understanding/using an anti-emetic protocol: you will quite likely puke out the SN and fail to ctb.
DO NOT use a mask instead of an Exit Bag, with inert gas: masks do not allow the proper combination of air exclusion and CO2 removal, and they are too easily dislodged post-blackout.
I'm sure there are other forum members out there with equally valid advice. I'm not a moderator, so I'm not in a position to make a formal request, but I would suggest that keeping your advice, with reasoning, very brief, to make it easier for newcomers.
If others here want to quote any of my suggestions, but in red, and amend them with better knowledge, be my guest.