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[Rustywreck]

Shooting form.
Draw horizontal, bend at the waist to the target.
It is a common mistake: People will point the bow down toward the target, then draw. Doing this will mess up your anchor and form.
Bending at the waist is key to shooting from an elevation, either up or down.
Aside from form, knowing the horizontal yardage is key. It doesn't matter what the yardage is from you treestand to the target - shoot for the yardage from the base of the tree to the target.