Dive in! It's like beginning ballet over twenty: you'd really have to trust your slow, consistent, building momentum to eventually get you there. Learning Clojure up to getting remotely competent with it did take me a year and a half, during which I used it in all my projects. Also including getting into Emacs. I breathed it all throughout. Now I'm good in it, I have ease designing big FP systems, and I finally decided to learn transducers a few weeks ago and it took me me just an hour to grasp/implement it in my app. Neither a decade :)