4 Tips to Master the Kettlebell Clean

Check out this video for the double clean in slo mo:

Let the kettlebells come all the way back to the end of the pendulum in the backswing - wait for the bells to start moving forward due to gravity before following with the hips.
On the upswing, let the kettlebells come up to the "weightless" point before pulling them into the rack.
Bring elbows into the body and the kettlebells will follow.
On the drop out of rack, use the hips to bump the kettlebell handles into your fingertips and ascertain the hook grip.