I recently bought an "Original Wyoming Knife" ( http://wyomingknife.com/knives.htm , scroll down ) to try in lieu of a head knife, which I don't have.
Wow.
I've been cutting my leather with shears / scissors and/or x-acto knives. With a tremendous amount of frustration, of course.
This knife snips right through. Nice thing? It is <$30.
I'm not saying this replaces a head knife -how could I, I don't have one? But it might be a good addition to your arsenal of cutting tools.
Nate