I don't know about amounts, I'd have to Google it, but I tried to ctb 20 years ago on all my antidepressants and propanolol was one of them. I know I remember everything up until I fell asleep, and there wasn't any pain. But I lost control of my senses and went for a "drive" to get something to eat before I fell asleep, and the f****ing car ran out of gas. I apparently (I don't remember this part on) got out of the car and walked out into the road, it was out in the country late at night. Some guy came upon me and I was able to tell him where I lived. He took me back to my apartment and he told my landlords, who called my parents. They came and I was unconscious. They didn't do anything until I started foaming at the mouth, then they carried me to the car and drove me to the hospital. I woke up and pulled out the tubes automatically, apparently this is a common reaction. I was put in the psych ward.
If I did it again I would use a lot of opioids, propanolol and probably use some weed beforehand for the feeling, and destroy my phone. With a partner, and out in the middle of nowhere so I wouldn't be found, although I would mail letters. I don't believe in common burial methods, I think natural is the way to go and it's really difficult to get a natural burial.
Sorry for the long response.