Can you put the first arrow where you want it every time?
Every time? No not yet, but I'm working on it, and getting much much better at it.
I will always need practice, and groups are good for me for form and sometimes tuning, but my hunting practice is single arrow "groups", always trying my best to put it "close enough to kill"
Nice groups are great, and I find them extremely satisfying to put in the bow target, but I personally don't think "X" size groups are necessary to kill a deer.
I reckon Orion's right on to it with his answer above
Best
Lex