I just installed some in my bathroom and a utility knife works fine if you're doing a small amount. You may need to score it about 4 or 5 times. I found it easier to score it from the rough side. As far as holes go, if you need to drill a large hole for a shower faucet, I used a jigsaw with wood/plastic blade. If you already have a jigsaw, it's alot cheaper than buying a large holesaw for 1 project.
: What is the easiest way to cut wonderboard? It says to score and snap, but what do you score it with.
: How about making holes?