A few years back I took in as boot a Barnett Rc-300 crossbow. I haven't really shot it much. The string is looking a little ratty. It's a compound bow, I want to change the string. I've been told that only a bow shop has the means to do this. On the other hand how difficult can it be to build a jig and change it my self. I really need to be able to change it myself, perhaps a bow shop won't always be available. Any thoughts? Has anyone done this with a compound?