I practice the first/Kill shot, I do this shot at different yardage. Then work on form. I only do this with 1 arrow first and when working on form I'll use NO more then 3 arrows.
The reason is I have broken more arrows working on form or groups then when hunting.. I would at times start close and work My way back.. 3 bulls I move to the next yardage 5,10,15,20,25 and 30 yards.
Mixing up different yardage and angles helps when out in the field hunting.. Now this is what I do and there are others that do thing differently..