Good call - I actually can't gybe without going strap to strap any more.

It's quite simple, and it won't take you long to get the hang of it.

Sequence:
Unhook
Back foot out and placed between the back footstrap and the front ones in the centre of the board and start the carve
Weight forward, mastfoot pressure, etc etc etc
Flip the rig early and agressively - really throw it away from you before you get dead down-wind
Roll your weight onto your toes on the front foot and loads of mast-foot pressure (pushing down through the boom)
Begin to sail away and then swiftly and lightly move your feet - front foot out and into the centre and back foot into the new front footstrap all in one smooth move

One piece of advice - it'll take you a few attempt to get it, and you will crash a bit, but you'll find it gives more control through the gybe. Make sure your footstraps are big enough to get out of them easily when you crash, and you'll be good to go.

Give it a go! Let us know how you get on.