Both old and new are pretty much the same Ken, but at least you get a new iron when buying new, plus the irons are pre-ground at 45 deg and ready for burnishing.  Once the hook is formed (Optional as it will work without a hook), you simply pop the iron into the stock (Frame) while it’s base rests on a flat surface and allow the iron to make contact with the surface beneath.  Lock the iron into place using the two side screws, snug up the central screw and adjust depth of cut by tightening or loosening the central screw.  They’re a breeze to set up and use. 🙂 😉