masking the handle
I wrapped a section of tape around the handle, marked off a line denoting how tall I wanted my zigzag, marked the center of all 4 sides of the handle and draw the zigzag connecting them. All marking for this was done free hand.
I then used an Exacto Knife to carefully (and not too deeply!) cut the tape so I could peel off the triangles on the front and back.
After that I taped off a bit more of the handle down to the blade, wrapped the blade in a towel and went to town with 4 coats of paint.