Think of after you acquire SN and any other medications to go with it, now you have the big red "easy" button if you so choose to go out. The only thing that overpowers you to not commit is your SI and SP (Survival Instinct and Self-Preservation). It takes immense willpower, rationalized thinking, and soul reflection to end your life. There are other variables in play such as "should I try X and Y to get Z instead?" and procrastination. Two differing things which is actually doing something or thinking about it another day, but they both delay the inevitable.
Every time I get in the tunnel vision of suicide, I end up self-reflecting for many days, coming to judgment about certain things, and then sometimes a fresh voice comes along and disrupts it, gives a new perspective, and then the process starts over next time I'm back in it. Over and over again. There's no "Fuck it, I'll do it now" impulsivity, some can do it that way, not sure if it's morally right or not, but I'm not in your life. In a way, when someone wishes suicide is easy, they just want the pain to end. I wish I can kill parts of myself so I don't have to feel that pain but keep on living normally. Shit is never easy, life is never easy, death is never easy even when you have the tools.