No, but a good assumption. I read several books and dozens of tutorials including parts of the 1000 page one that couple did like 6 years ago. Function application and so on definitely came before IO and the likes. It all just seemed like enormous mental effort for the simplest of things. That was my experience at least. It's possible I just don't have the best kind of brain for FP.

Your mileage will vary of course. This was just my experience. I know Haskell is powerful, but it wasn't right for me. I haven't met a scripting language I didn't like yet though, so perhaps my neurons are just wired for that now. I do enjoy the random APL or Forth problem though and I'm decent at SQL after using it often for a decade.