I can garantee you it isn't easy from a physical point of view. People get hit by trains and survive, that's more punch than most anit-tank guns pack you know. A lot of people die of stupid shit every day, but for a normal healthy person to die takes a lot of force which is often not easy to obtain or inflict yourself. Hanging is probably the 'easiest' way, but 15 minutes or more of suffocation can hardly be called easy.
If you don't believe me, you can slit your wrists this evening till you see the muscle and then call me up in two days to ask how long this shit will take cause your carpet is pretty much ruined at that point.
Or, you can sit in your garage and turn your car on. Problem solved. Or jump off a fucking building, just make sure not to wear the D3s. Those can take any sort of impact and yet still give you precise technical control, perfect for nose manual nollie flips.