With my hand, unless it is a deep dish, then I use a fork or cut the slice into or three, then use my hands.
Alfonsogirl, if you are ever in Ventura CA, hit up Tony's, it's a small place near the brewery, it's been there forever, another is Sasso Cucino, near the waterfront. Those are two I can think of down in the LA area close to New York style, ever since Dom's and Josephine closed down in LA, at the turn of the century.