HI, I would see if you can take a beginning quilting class. One of the first skills they teach will be accurate cutting. How to keep your ruler from slipping, walking your hand up as you cut etc. Well worth the price of the class. Also, there are lots of cutting aids out there. The ones that come to mind are the June Tailor shape cutter rulers. It's a large piece of thick plastic with slots at intervals. Your cutter rides in the slots and helps you make a straight cut. I'm pretty sure you can get them there.