One of the more uncomfortable, deliberate and distasteful ways to go would be to eat at McDonald's three or more times a day, seven days a week, 52 weeks a year (if that long). By the time that the morbid protocol takes its toll, the subject won't want to live anymore.
Hah - so much for the 1st amendment. Lesson - never speak to psychiatrists in countries where doing so can get you carted off to the funny farm.
Simple question: If you were going to live yourSelf, how would you do it? It's a trick question. Careful how you answer in some states. (don't worry, not planning on dying anytime soon.) Christ!
One used to be able to go to Monroe Institute to learn how to "die", OBE style, and go to "level 24". Not my style. Christ!
In keeping with the ways sent down by our benevolent and graceful God. We shall die they way 99% of all living beings die. Being ripped, torn and eaten alive very slowly.