Loosen your hips by setting up to a chair, straightening your torso and wiggling your belt buckle
Create a pre shot routine in three phases, one where you visualize, one where you align and one where you pick a key to initiate the swing
You might not have time to practice as much as a professional but you can have their set up in a matter of minutes, concentrate on keeping your upper body balanced on top of your lower body with your arms centered and not ahead of the ball