If you want to Hex Edit, you'd better save a copy of the game. You need a Hex Editor, (I suggest Hex Workshop or Hex Editor). You search for the file you want to replace and you put in the one you want, but it has to be done properly, otherways, it wouldn't work. The game would crash. Once you know how to do it, it's easy.
To edit ctms, you need the Editor and the stats (Stats Guru at
www.cricinfo.com) and that's it,it's not hard,but it takes about an hour or two to update a whole team when you start.
Are you going to Kit edit too?