I mean... If you're learning a trick like a cork 7 for the first time, and it has a unique set, most people can't just throw it first time and bring it to their feet. For me the natural way I fell when learning it was I would open up and then just land on my back/ass. It was only when I stopped trying to land on my feet and began focusing on landing on my back/ass that I was able to pay attention to how to set the cork spin with my body. Once you have the proper set it's only a matter of committing to the trick to land it, difficulty with cork when first learning it is that the set/rotation may not come natural to someone.
So many other sets like misty, flat spins, etc, are pretty easy to visualize and do, but since cork is in between the other inverts it is a bit harder to grasp at first. Once you learn it though it really becomes super easy rotation.