I have a couple of friends and relatives who have celiac. My favorite GF flour mix is called cup for cup. It is of course expensive like all GF products. I have had good luck with just substituting the Cup for Cup flour for regular flour in recipes. If you make a pie crust, roll it between 2 sheets of waxed paper as it will fall apart otherwise. My SIL buys ready made GF pie crusts at Trader Joes. Also if you have an Aldi's in your area they have a lot of GF products. My nephew and his wife both have celiac- his favorite cookbook is Americas Test Kitchen GF cookbook. They explain the science behind things. Awesome cookbook.