I have attempted full suspension hanging but not with the intent for my cause of death to be hypoxia.. At least, I was lucky enough to not suffocate because my plan to hang myself that day was completely impulsive.
I failed because the anchor point was too close to the ground and I somehow managed to save myself, I don't understand to this day how I managed to do it but I guess the world is full of surprises…
Full suspension hanging with hypoxia is basically like suffocating yourself. Just hallucinate and imagine yourself hanging from some place and choke yourself if you want to feel what it's like. No, I'm not encouraging that you do this. You must act based on your personal autonomy and your metric.