Bending at the waist is key. When you go to shoot have a short list to follow for each shot.

For flat ground I like
ease (smooth draw)
anchor (kissing button and peep, lined up with my pin)
squeeze (squeeze the release and not snap my finger on it)

For elevated I add in "bend" after "anchor"

When a deer is in front of me I mentally tell myself to "calm down" That dump of adrenaline into the system can make you rush a shot from excitment.