I am replacing 20 florescent light diffuser panels that I need to cut to size. Bought the diffuser panels at Home Depot but they do not cut them. I bought the hand cutting tool (sort of like an exacto knife) that was recommended to use to cut them but I am having trouble getting a smooth cut and keeping them from cracking and breaking. The panels keep cracking and breaking along and across the cut line rendering them useless The instructions said to score the line first, which I did. Does anyone have any experiences with cutting these panels? I know their must be an easier, more appealing method. The one I cut which fit took forever to cut and the sides, which are hidden are really a rough cut. I really would appreciate any help or suggestions. The ones in which I am replacing have nice smooth cut sides.