Skeet,
I have used the etchomatic for years for various metal marking jobs and have found if I use a barrel stub for practice I can get good results with it. The best tip in my opinion and experience is to use a Qtip for the marking, it is easier to control for smaller lettering jobs. The stencil maker kit is a must have but I have yet to master the devolping of the film, sometimes my stencils come out great sometimes they don't.
I also have a cnc mill with a diamond drag bit and a spinning cuter I use for some items but I usually use Etch O matic. I will admit I just plain suck at stamping so I gave up on that, even know I am a journeyman hammer user haha.
If you are interested I can email you some photos of finished jobs and such. Maybe ill make a video showing how I use the Qtip method.
James