I use the little clear rubbery stick on dots on my ruler as they grip better than the sand paper ones. I also find the Olipfa ruler helps as it has an actual lip or edge that grabs onto your cutting board and really helps with cutting accurately as your ruler doesn't slip. You also need to be using a table that is the right height for you. My kitchen table is great for me (I'm short) but my counter is too high and I can't "get over" my cutting in the same way. A sharp blade is imperative both to cut the fabric cleanly and accurately and to avoid slips cutting you. It's also important to hold the cutter correctly and have it pependicular against the ruler and not on an angle. I often cut six layers at a time using these methods and am always the "cuuter" at guild stitching days.