I developed my own technique. Hacksaw, miter box, file, and some sandpaper. Clamp the barrel into the miter box. I use rubber-faced sliding clamps. Cut the barrel so there is about 5/32" of barrel in front of the rib support. The ribs will determine where your cut goes. Anything over 18 1/8" is good to allow you to file down some if you have chatter marks.
Anyway, once you cut the barrel, it should be fairly square. With a wide, fine file, dress the face of the barrel so that there aren't any marks from the hacksaw. Slightly bevel the outside of the barrel so it doesn't feel sharp to the touch. Jewelers files or sandpaper wrapped around a pencil or dowel will dress the inside of the barrel.
Now, take a pair of jeans and lay a piece of 220 grit sandpaper on the jeans. The jeans allow the sandpaper to give and curve around the metal at the muzzle so it isn't sharp.
Once the muzzle is dressed, CAREFULLY file the rib back to where it looks good and break the edges so they aren't sharp. Don't hit the barrel while you're doing this.
Drilling, tapping, and installing the bead takes some more skill. Won't go into it here.