Everstamp is by FAR the leading and preferred place to get a stamp made for knifemakers.
I forge my blades....and I stamp cold. I press it in with a cheap harbor freight arbor press. Like I said....it takes 30 seconds.
You don't need any special jigs, fixtures or holders. You don't need to weld a holder or otherwise alter the arbor press, rendering it a single use tool.
Simply make a pencil or scribe mark on your blade where you want your stamp, lay your blade on the press under the ram, position your stamp on your mark, let the ram down (the weight of it will hold your stamp in place), visually check your stamp for straightness and lean, apply pressure with the handle and give the ram a rap with a hammer if so desired and you're done.
No messing around, no rushing to stamp hot, no burned fingers or gloves. The stamp is exactly where you want it every time.