I am careful, but the small rotary cutter (45 mm)? is what I use all the time. I had a terrible time with a K quilt I just finished. First it was eyelashes on the back, then the backing got skewed, then the backing edge got folded underneath...whew! I about lost all my religion--- but the rotary cutter made faster work than stitch picking. Just wiped the thread bits w/tape and plowed on