If you tool leather for any length of time, you will find some pieces that seem to feel like your trying to carve into a piece of concrete. Nobody’s leather is perfect and every piece you pick up is different than the last…. Welcome to working with leather!
I have found that adding a little Murphy’s Oil Soap to your case water will help to lubricate the fibers and allow your swivel knife to glide through even tough leather a lot easier. As always, be sure your knife is sharp and strop it frequently.
Sometimes it’s the hard leather that produces the more elegant results, so try and relax and do your best… If leather tooling was easy everyone would be doing it.