Understood entirely, could you possibly suggest something better? So sorry that's a strange question

I was initially going to use rope.
Well it all depends on you and your budget. A rope is pretty cheap and hanging itself is a reliable method. There's plenty of megathreads in the suicide resource compilation. You can read it if you'd like.
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I'm not a fan of pain myself so my plan is to OD on Fentanyl a strong potent opioid drug.
I also don't think hanging is that painful as far as I know it feels very discomforting until you fall unconscious.
Your head will feel heavy like it's going to explode. With hanging there's plenty of cons if it fails.
Coma, Brain damage, broken neck, and so on. There's no need to add more pain than there already is so don't cut just to make it foolproof than it already is.
A method should be near painless, reliable, and fast.
A rope should be pretty easy to get. You can ask for some rope recommendations on here or just look for one that isn't too thin and can handle weight without breaking.
Amazon sells pretty good ropes as far as I know.