When I was learning to use a rotary cutter and ruler, I watched someone on Simply quilts who used two rulers. One ruler measured the width that was needed and a second ruler was then butted up against it and the second ruler was the one you cut against. I use the ruler on the right to measure and the ruler on the left to cut -- I actually lay my forearm on the cutting ruler because I have hand and wrist problems and can't hold the ruler with my hand. It works well, but DH got me the Accuquilt Go Big for Christmas and it is a dream for the dies I have -- I just have to make sure the pieces are big enough to cover the blades (they don't need to be straight) and the pieces come out perfect every time. For the Go, I do still starch.