SLOW DOWN. Yes that's it, just do it slowly! Bring your kite to 12, staying low with knees bent as if you were going to sit down, then before your bum (ass for those Americans!) would normally touch the water, you dive the kite in the new direction with weight on your new back foot. That's it! 

Troubleshooting: 

If you're sinking  - keep your bar in to keep the power, and dive your kite a little sooner. 

If you're being pulled off your board or into the air - slow down! 

If you're loosing speed after transitioning - go downwind a little first before edging back upwind. And dive the kite again if needed. 

Happy transitioning!!!!! 

Katie and Tom