Truthfully. Nothing. Sadly almost every method you look at takes planing, meds, supplies, a good location etc… every methods success rate is determined by attention to detail. And even if you do everything to the T there is always still that chance of failure. And with that unfortunately comes consequences as I stated earlier. I know this isnt what you want to hear right as you sound desperate and suffering. But if a full proof method with little to no suffering did exist I surely wouldn't be here talking to you.