RE: shoot ing from stands
get out in a stand and practice from it. bend at the waist and keep your anchors the same as they would be as if you were shooting from the ground....theres no difference in impact....
shoot the distance for the same distance you would from the ground. if its 20yds from the base of the tree to the target, shoot for 20yds.
best thing to do is get in a stand and practice....no substitute for it