I still have the deep scars to prove it.
In summer of 2006, I was determined, slashed the right way and then dug with the Stanley #99 box cutter. I passed out in the bath tub, to keep it clean for my wife. I woke up, I think, about an hour and a half later. I failed. Evidently, my blood clots really well. I changed my mind. Took a cold shower, washed all the blood down the drain. Took off my wet clothes. Wrapped towels around my wrists and put on sweats and went to sleep for 2 days. Woke up in a facility, looked at my stitches, went back to sleep for 5 more days. (not the end of the story but is for here)
There was nothing that would have stopped me before I passed out... I was bleeding like a stuck pig, I was happy. If I'd have thought about using the gun in the house (which still is BTW), it probably would have been successful. It never even entered my mind since its (still) properly stored in the safe with a trigger lock and out of sight.
Please re-read that last sentence.