Need a Painless way to get the deed done Overnight.

Something very effective but definitely painless...I've scrapped the idea of hanging myself, i cant ever tie a strong enough knot..that would just mess up my neck i think. I've been reading about all these different benzos here, but from what I've read, its kind of a hit or miss thing... I need something much more solid.. No getting a gun would be impossible..I live in India...