Last year I did my first canti stud install and it went quite nicely. The jig I made is similar to what others have done, but much more crude looking. It clamps down to the two tubes that are getting the studs and allows me to get them aligned properly. Brass filler is what was used. You can do it so long as you prepare for the job at hand. FWIW, it is easier and safer to use heat when removing the old studs. No chance of cutting into the tubes, they just fall off or pull off with a pliers while being heated.