...Whatever. I'm guessing you have dark powers. You don't have to be a Heartless to use darkness.

It usually takes a special tool to do it. If I tried to take my heart out with my bare hands I'd kill myself. Sora... He had a strange Keyblade that'd been made... And who knows what Xehanort's Heartl-- Well, "Ansem," had. Probably some machine.