Northern Tools (an online supply company) had these shears made specifically for cutting this material. It makes zero dust, just this somewhat annoying curly kerf material. It cuts fast, and can cut some larger radius curves, too.
You also get staighter cuts, simply because you can see your pencil line that's normally lost in the dust cloud.
As I mentioned before, I'd only used this material on other people's houses, which meant I always had someone else to work with. You really need someone to hold one end of the board to get it into place. Northern Tools had an automatic recommendation ('Many customers also bought....') The kit wasn't expensive and got very good reviews from people that souunded credible, so I bought it. It's two parts---the first is this metal clip that wedges behind the previous board to hold one end, offset away from the wall by an inch.