for simplicity, I would sight in from the ground 1st, tuning to get the BH to hit like FP. Then I would most certainly shoot from a tree, preferably in your hunting jacket. At that point you will know where you hit from a tree. If you keep good form and bend at the waist you should hit the same, but there is no way to know for sure. Also shoot at every distance that you may face, from in tight to your max. For me, it seems like the tighter in I get, the more off my pins are.