I do a fair bit of carving using knives. You COULD carve with a knife but it doesn't act the same and it definitely is going to be a difficult carve. On the other hand a half round bastard file like Stacy mentions works really well. That's what I give to my students when they are shaping their knives. It works really well and the kids love to use the name! I have sandpaper that starts at 40, 80, 120, 200, 400, 800, 1200, 1500, 2000. I use the paper wet when I get to 800 and above.