Finally buying a gun this week

Excited. Finally buying a 9mm handgun this week. I'll get the ammo soon enough too. Had thoughts for years, daily.

Does anyone know the best sure-fire way to do it? I'd assume rear temple would be the best bet to ensure you don't make it. I hear you can survive if your frontal lobe gets damaged/injured, so I'm going for the middle/rear when I do it.

Because my only fear is messing up and surviving somehow as a disabled vegetable.