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Legs up. I use a drip pan with Apple Juice/Apple Cider Vinegar mix and place it on the P.S. I also add some sort of spacer under the drip pan (3 stacks of 4 pennies work just fine). I don't think everybody uses a drip pan with fluids in it though. Enjoy...it'll turn out great.
I do it legs up and put a drip pan under th butt.