If you can't find MixIt Universal GF flour mix by Schar, you can use another GF flour mix of choice. Just make sure it's a GF flour blend and not just a simple GF flour. Also, if you try this pizza crust recipe with regular all-purpose flour containing gluten, it may not work. Gluten makes the crust more elastic and it may not have the same texture, so the technique cannot be applied. The dough is meant to be very sticky - grease your hands with a little oil while shaping it.