RE: Rookie mistake
1. I try to pick my shooting lane and then draw when the deer's head is behind a tree. That way they do not see you draw your bow.
2. Try to have a slow smooth motion when you draw your bow.
3.You'll find when you have a quartering away shot or when the deer is braodside facing away from you, generally they do not see your movement as much.
Good Luck, nobody ever said it was easy!