Anecdotally, I had the opposite experience. From the first time I loaded up Calibre, I mostly understood how it worked. Perhaps it just clicked with me easier

Anecdotally, I had the opposite experience. From the first time I loaded up Calibre, I mostly understood how it worked. Perhaps it just clicked with me easier than with others, but other than the "bare bones" interface, I think it's a reasonably intuitive program.