It's really not that hard, most of it is learning how to control the file so it cuts where you want it to cut, and NOT where you don't need to cut any more. The last part is what happened to me, then you get to learn how to adjust for oversize dovetails. Fortunately I was smart enough to mess up on practice pieces.
BTW, the adjusting for oversize practice came in handy when fitting sights on friends' muzzle loaders. Dovetails on the cheaper MLs seem to all be just a little bit different.
