Break your swing up into several parts.
At the address position, your arms and chest form a triangle.
Practice the take away by moving this triangle in one piece without changing any of the angles, which means no wrist movement.
Take your club to waist height and stop there.
Practice this over and over again, during the day when you have an odd moment.
You do not have to have a club in your hand.
Simply adopt the grip position of the hands by holding your left thumb with your right hand.
It is essential that you do not use your wrists in the take away.
Next take your swing to the top and look at your hand and arm position.
Assume this position by performing your backswing at odd moments.
Next start the down swing by turning your left hip, and then continue the next part of the down swing until you are just behind the ball.
This time with a club, note the squareness or otherwise of the club face.
Next, with a club, start with club head just behind the ball and continue your swing making sure you have firm wrists and that you are hitting with you arms.
Continue through to the finish of the follow through, making sure that your right forearm crosses over your left on the way.
Practising during the day as often as you can will result in a grooved swing for you that will happen each time you hit the ball with very little conscious thought or mental input from you.