Season pieces with salt and pepper. Season flour with salt and pepper. Melt 4 tablespoons of Crisco in a cast iron skillet. Roll or shake squirrel in seasoned flour and put in medium hot grease. Brown on all sides. Put in pressure cooker(be sure the rack is in the bottom of cooker)and add 2 cups of water. Cook on 10 lbs. of pressure for 30 minutes after it starts jiggling(adjusting flame so that the jiggler will jiggle about 4 times a minute). Turn fire off for 5 minutes. Put cooker in sink and run cold water over the top to cool it down. Take the top off and you will have the best squirrel you ever ate. I have been doing this for 30 years. Make some gravy and cook some rice and get your significant other to make some biscuits and you will be a happy person. This recipe will work on the toughest squirrel alive. Also good for rabbits.