I recommend reading the CO poisoning megatrhead. I'm planning to do the CO method with charcoal and toilet. But you need to understand that CO poisoning is very hard to do and you might still be alive in the end. Brain damage is a consequence. Also, I really like Yonlu and I'm Brazilian. Be careful not to get too inspired by the guy's story, take it easy and find the method that's right for you if that's what you want.
Also, forgot to say, i've read that 2kg - 4kg of charcoal should do it, but the more the better