Some time ago I had to score the replacement light panels (maybe a plastic type material) for my kitchen lighting because the standard size did not fit. Here is a similar picture of the kitchen light panels in my kitchen...
or if this URL is too long...
It took me almost an hour for each panel and was a royal pain. I asked Home Depot then if there was a tool for this and they said no, just score it. Just wondering if there is an easier way for future knowledge???