Earlier quoted context omitted.
No, you wouldn't be able to do that. They burn themselves to death.
Burning to death only hurts briefly, when the nerves have had enough damage you can't feel. Adrenaline helps block pain, as well. Besides, self-immolation is not exclusive to those who have practiced mindfulness. Ever had a severe accident, like a motorcycle accident, or been ran over by a car? The pain comes after, not in the moment when the trauma occurs.
And yes, I have been in high pain incidents. I recall the pain happening during and after.