Alternatively, you can use an auto-clicker, and just hold down one of the number keys to keep using your special attack, then all you really have to do is move the mouse around to aim
It's almost the lazy man's method, unless there's also a program that is like an auto-clicker, but for keyboard keys so you never have to press or hold down the number keys, in which case all you'd have to do is just move the mouse around to aim