I'm glad you've reconsidered. The skin is the largest organ of the human body... If it sucks to have just one organ hurt, imagine one that covers literally every part of you lmao. Sadly I've seen videos of people burning to death (The Station Nightclub fire, anyone?, plus the video of the men caught on fire after an oil spill, Aaron Bushnell, etc.) and it's gruesome, excruciating. Thich Quang Duc was just operating on another level to do it so silently.
You'll hear of people who died (some of which sounds like a possible CTB) by drinking or drugging themselves unconscious and then setting their homes on fire, but the difference is that they probably just suffocated from the smoke/fumes and died by asphyxiation, not burning. I still wouldn't recommend because it could put some firefighter in danger or harm neighbors or the environment, etc.