My opinion is that it's a double-edged sword. It's like when someone recommends you to learn SQL and relational algebras, and you, coming from OOP world, say, oh, I can learn some ORM first, that will make it easier.

Personally, I found that diving directly into the language that represents a paradigm in the "pure" form (for FP I would recommend Haskell) works best for me. It makes it most obvious why things are done certain way.