I understand the feeling of wanting to try, even if only to feel the pain or "punishment" you'd get from it, but... please rethink this. OD CTBs aren't just "you either fail or succeed" type suicides, they have major consequences.
I'm sure you have seen a million people on here posting about failed attempts. Now, put that into perspective:
Let's say you survive the OD and wake up in a puddle of your own vomit. You go about life and try to find a better way to CTB. But, before you can either succeed in properly CTBing, or setting up a fool-proof plan, you start to notice something is... off. Your skin is just a bit yellower. Your eyes moreso. You're starting to feel sicker, more fatigued. Suddenly, CTBing is getting harder to plan.
You try your best, but soon realize that you are resigned to a slow, painful death from liver failure—either that or someone notices, and you are put on involuntary psychiatric hold. There's a good chance that something like that would happen anyway if someone found you after the OD.
Maybe the tragedy of it all calls to you. But can you be sure that you won't regret it?