Originally Posted by MadQuilter
I find that my ruler tends to slip when I don't have good leverage. Standing over the ruler works best for me. I also do not try to do a full range cut in one motion. Instead, I firmly hold the lower half of the ruler and cut about half way, then I walk my fingers up to hold the upper half and cut the upper half. For really long cuts, I even distribute the weight into thirds.
Very good point. I do the same.