Kamikuza said..
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Like this? Two minutes 9 seconds in...
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Sort of. There's a zone of stability stretching from the top of the mast to about 3/4 the way to the front foot position. The size of the zone depends in the amount of power you're putting into the foil and the sea state and the size of the wing and the colour of your undies and stuff.
You can put your feet pretty much anywhere inside this zone and ride. At the end of a session I quite like to stand in the "foiling Jesus" position as I ride into the beach. Both feet together. Stand bolt upright. Arms outstretched. Smile.
If you're nicely powered up you can put your feet quite forward like the guy in the Mac video.
If you're less powered up you put your feet further back towards the mast.
So, yes practice the footwork that the Mac guy shows in the video. Yes practice it out on the water. But maybe start off with smaller steps and keep your weight back towards the mast.