Practice a lot. A lot a lot a lot a lot.
I've never bowhunted before, but the stories I hear from bowhunters is that you have to be extremely good with your shot down to pure muscle memory and instinct before you're good enough to hunt. It's like making a shot in the gym versus hitting it in a real game, the conditions and adrenaline and everything are so different when you're really out in the field. And if you miss, it's not just a miss like "oh well", but a lot of times you hit the animal in the leg or the mouth or some shyt that doesn't kill it right away but it dies after a few hours or days so you never find it and all the suffering was for nothing.