The thumbprints on my fingers feel raw.
I visited a Macadamia farm over the weekend, and having enjoyed the pumpkin and macadamia nut scones fresh from the oven with a bit of cream and jam, proceeded to scour the ground underneath the trees in the grove for some fruit. Apparently they're not ripe until they drop off the tree, and you need 12 weeks to dry them in the shell before you can crack the nut from within.
But to dry the shell, I had to remove it from the casing. First attempt was with a knife to top & tail it, and then peel the green skin off. Have you tried skinning a golfball? Yeah, it was just as successful as that.
A nut cracker (or lobster shell cracker...?) came to the rescue, but the trick was to crack the edge of the skin, and not the central bit that instinctively you go for ~ after all, these are the hardest nutshells in the world.