Early in the day:
Grease cookie sheets.
Measure the dry ingredients into a sifter and sift into a bowl.
Cut in shortening with a pastry blender.
Make a small well in the center and pour in the milk.
(You should have enough milk to make the dough soft, but not sticky.)
Mix lightly with a fork. 
Turn dough onto floured, cloth covered, pastry board.
Roll out to 1/2" thick.
Cut with 2" round cutter.
Arrange on cookie sheet.
Chill.

Time to make biscuits:
Half an hour before serving, remove from fridge.
Heat oven to 450°.
Bake 12 - 15 minutes or until brown.