Don't handle lead with bare hands. Get some of those disposable vinyl gloves from CVS. They still allow good feeling in your fingers but keep the lead off your skin.
From what I've read, lead isn't absorbed directly thru your skin anyway, it enters when you eat/smoke or touch your eyes, mouth with it on your hands. Wash your hands often and make it a good cleaning.
Don't use any kitchen utensils in your molding, casting and then reuse them in the kitchen.