1. Pick the design you want to etch and cut it out on vinyl. Place the vinyl on your item (in my case, a couple of knives) and cover the surfaces you don't want sandblasted. (Picture 1)
2. Sandblast that baby! Be sure to do an even job, but be careful to not overdo it! You might wear off the vinyl around the design and make the image fuzzy.
3. Peel off the vinyl and wash your product. Ta-da!