Gunnar's video above is great.
Here are some points to emphasize that work for me:
-learn the heelside to toeside footswitch first
-be sure you can ride toeside first (gybe to toeside and then ride toeside..without any footswitch)
-be sure your front footstraps are loose enough to get in and out of easily
-go quite fast, it makes the board more stable and gives you more time
-rotate your body stance toward toeside before switching your feet so that you don't have to rotate as much during the foot switch
-keep power in your kite but push your bar out a bit.. try to become light by having the kite lift you
-just before switching feet bounce your body upward slightly to take weight off the board
-be nimble with your feet (my friend says it is like ballroom dancing)
-at first I found a "jump" footswitch was easiest.. I moved both my feet simultaneously rather than one at a time
-don't try to gybe, just switch your feet while going forward and then gybe afterwards
At first you will touch down during the footswitch and as you practise the touch downs will get shorter and shorter.
I hope some of the points above might help somebody.