Stillhunt, all the guys here are correct in that you should practice from many different angles, and in many physical positions... i.e. in a treestand, on the ground kneeling etc.

You should also practice with any face masks, gloves etc. that you will be wearing this fall.

The rule of thumb on arrows is shoot as many as them until you become fatigued. Atired shooter will began to pick up bad shooting habits once he reaches physical exhaustion. Stop shooting when you get tired!