Gunshot to the heart with a 9 mm Glock 19 gun, with Full Metal Jacket bullets. Would it kill me?

[iwantitalltoend]

Be sure to aim right
If you can take heavy painkillers prior and perhaps another in the head, or a few more in the heart

I don't think painkillers are necessary. What do you mean by another in the head and a few more in the heart? You mean if after I shoot myself in the heart I can shoot myself again in the same place? I know this would be a good idea to be even more certain I die but I'm not sure if I'll be able to hold the gun and shoot myself again in the heart after the first shot