Method SN success rate with just meto, beta blockers and pure SN?

[ihatemyselfsomuch]

Many methods I have read recommend taking benzos and a number of different anti-emetics alongside the essentials. How would not doing this impact my chances of dying?
For context I'm a young, healthy male.

 

[aminend]

Even SN alone has high potential to kill. Other medicines only makes the death process more peaceful