Eageus 8 Pcs Small Letter Metal Stencils for Painting, 1/4 1/2 3/4 1 Inch Alphabet Template Wood Burning Lettering Stencil for Carving Engraving Journal Pyrography Craft(Tiny Letter)

To start she most likely did, enough to build muscle memory of the letters, then discarded the stencil, eventually the ruler, and went to other methods to help line up when doing text. Back before sandblasting, and quicker methods, it was one technique for etching stone and other things. https://www.amazon.com/Stencils-Painting-Lettering-Engraving-Pyrography/dp/B0FRSTJLKS?th=1 These are not new, they were around literally BEFORE Jesus was a baby. Or pretty much the existence of any Jews by about 50k years. lol! https://www.livescience.com/archaeology/worlds-oldest-known-rock-art-predates-modern-humans-entrance-into-europe-and-it-was-found-in-an-indonesian-cave