Pre-heat oven to 425-450. If your oven cooks hot use lower temp. Add your flour and fat (butter or shortening) to a mixing bowl. Cut the fat in by using a pastry cutter or a fork. If your butter is frozen you can also use a box grater to grate your butter into the flour. This works well too. Add your milk to the mixture and combine. If the dough is too dry add in a little milk a tablespoon at a time. Same goes if the dough is too wet. Add in a little flour a tablespoon at a time till you get a nice well formed dough ball. Once it has formed a well formed dough, turn out onto a floured surface. You can knead a few times by rolling over on it each other. Do not knead too much as it will make your biscuits hard. Another trick is to roll them out and then fold over a few times. This will help build layers in your biscuits. Again, the trick is not to do too much with the dough. Roll your dough out till it is about 1/2 inch thick. Use a biscuit cutter to cut the biscuits. If you do not have any, you can use a glass cup or plastic cup will work just fine. Place biscuits on a greased metal sheet pan then brush the tops of the biscuits with the melted butter. Place metal sheet pan in a pre-heated oven at 425-450 degrees for 10-15 minutes. Once the tops get to the desired browness, they should be done.