You absolutely want to practice from a tree stand, or even your deck. At any given distance gravity has an effect on an arrow...when shooting from an angle, gravity has less of an effect. The reason is because the trajectory is determined by the horizontal distance the arrow travels, not the overall distance. When shooting at steep angles wether up or down, aiming for the exact distance could be a mistake, since measurement may actually be considerably larger than the horizontal distance. at steep angles, you must learn to compensate by aiming low.

It really is all gonna depend on how steep your angle is, if its downhill or up hill. If its a very small angle and not much of an incline or decline, you're gonna be okay with using the pin you have. Just keep that in mind while shooting downhill from a treestand.

i hope this helps.