Not hard, but time consuming.
Rendering the lard is time consuming. It is pretty much making jerky, grinding it up and mixing with dried fruit and rendered lard. Then letting it cool. Pour it into cupcake tins with the paper inserts.
Usually it should be equal parts protein and fat. And a small bit of dried fruit or berries.
I really want to try coconut oil instead of rendered lard, but it turns from solid to liquid at a lower temperature. I have not tried coconut oil yet.
It is high calorie per weight, just what one wants when out hunting. Carry less weight per unit of energy. I will say it is not an epicurean delight. It is energy.