I hold mine like a steak knife if that's any help, with my forefinger extended down the cutter towards the blade. This is how I was taught my by art teacher, so I guess it's one of the right ways to do it!
Charlie.
P.S., it's also like a type of tennis grip that not many people use.
Does anyone know of a site that shows how to position these things properly? Or can someone explain it? I have one of the FISKARS cutters. Are there any brands considered more ergonomic than others?