About use xanthan gum in baking bread, I think its process as follows:
First, confirm how about xanthan gum food grade viscosity and how about liquid viscosity that you need mixed into flour for baking bread
Second, confirm mixer or Mixing tank with Mixer in its bottom that can help xanthan gum dissolve into the liquid, I think Mixing tank is good, you can put xanthan gum into mix tank slow with different speed of Mixer
Third, dissolve xanthan gum into liquid by Mixer with different speed or Mixing Tank with mixer of different speed, key point put xanthan gum into liquid slow with process of dissolve
Fourth, use the liquid with xanthan gum and that liquid have good viscosity to knead dough
Above process is just normal way for use xanthan gum, but as xanthan gum application for baking bread or an other food is so complex, especial mix xanthan gum food grade into liquid that need high speed mixer or mix tank with high speed mixer, so normal xanthan gum food grade is not good for family use, it is just good for food factory
Instant xanthan gum food grade, I think it is good for family, as which can dissolve into any liquid that your need by low speed, such as eggbeater