The old adage about at 50 hours you think you know everything etc. is true!
I can vouch for that. I was a know-it-all.
It is all well and good being able to do it with the instructors sat next to you but when you need it for real the task loading is massive.
I can vouch for that too. But I think this is fairly typical for me and aviation. Each new step seems insurmountable, but it always (so far) clicks into place.