I've done it tons of times with varying degrees of damage. The bigger built bodies (Batman, Hawkman, John Stewart, Dr. midnite) Can be pretty difficult, what I do is drill four small holes. Two on the shoulders near the neck and two under his armpits. Pry slowly and work my way around to each of the holes. Be firm but not too firm and you should get that nice crack sound. You'll need to fill the gaps in once you put the body back together though.