Originally Posted by MadQuilter

A lot of slippage happens when we try to cover too much ruler area with one hand. Instead of holding the ruler in the center, I now hold it in the lower half. I cut only as far as my fingers can support the ruler. Then I walk my fingers gingerly up to the next section and cut to where it is comfortable. On long sections I can have up to 3 sections to cut. It works for me.