In my days as a paramedic there was nothing worse than to be called to an attempted suicide when the procedure went wrong and the person did not die but was left in worse condition. Often the advice in these books does not include information on what can go wrong. Imagine botching your suicide and then ending up on a respirator in a persistent vegetative state or with complete renal failure and on dialysis. Even a shotgun blast to the head may not be immediately fatal ..knew some paramedics who had such a case.
I knew a guy years back that tried suicide with a shotgun. At the last moment, he flinched and ended up blowing his jaw off along with some lower pieces of his skull...He survived that attempt. I don’t know what happened to him after that...
I'm sure he never considered the pain he would cause his loved ones beyond the initial shock of his death, and I always wondered if he was ever aware of the tragedy he had caused.