First big tip to you for your pie crust: keep everything cold. That will help keep your crusts tender and flaky. Here’s a good basic dough that will give you enough for a 9" double crust:
2 1/2 cups AP flour
1 tsp. salt
2 Tbs. sugar
12 Tbs. Butter, cut into 1/2" pieces, chilled
8 Tbs. Shortening, chilled
6-8 Tbs. ice water
Combine all the dry ingredients together, and using a pastry blender, cut in the butter and shortening until the flour is starting to get the texture of cornmeal with about half about the size of peas. Using a rubber spatula, start adding the water a tablespoon at a time, and fold the dough together until it sticks together. It’s ok if there’s patches of flour and butter–this is a good thing. Only handle the dough just enough to stick it together. Kneading pie dough will give you a tough crust. You don’t want it to be a smooth dough like a cookie batter. Remove dough from bowl, divide into 2 equal parts, press into discs, and wrap in plastic wrap. Chill for an hour before rolling out.
For the blueberry filling:
6 cups blueberries
3/4 cup sugar
3-4 Tbs. tapioca (uncooked instant–You can get it in your pudding section at the market, Minute Rice sells it in a little red box. Use less if you like your pie juicier, more if you want a more firm filling)
2 tsp. lemon juice
1 tsp. grated lemon zest
1/4 tsp nutmeg
Combine all of above and toss in a bowl, and set aside while you roll out your dough.
Preheat your oven to 400.
Roll out your dough to fit the pie plate, fill, and seal with top layer of dough. Cut some vents on top, and if you want your crust to look really pretty, you can brush some beaten egg or heavy cream on top, and sprinkle a little sugar on the dough.
At this point, I like to stick my pie in the freezer for about 10-15 minutes, especially if it’s warm and the dough has softened, before putting into the oven (but it’s not necessary).
Place your pie onto a baking sheet, and bake at 400 for about 20-25 minutes. Reduce oven temp to 350, and continute to bake until the juices are bubbling and the crust is a golden brown, about 30-40 minutes.
Let it cool on a rack until room temperature, about 2 hours, before cutting, so the juices have time to thicken.