Hi Community!

So I've been learning country for a while now. I've learnt some good songs, but I really want to learn Willie Nelson's classic "On the Road Again". I am using a classical guitar with nylon strings for this and a 0.46mm pick. I can't seem to play the whole song from start to finish. The grip of the pick is not that easy, and it is hard to lay emphasis on just the right notes.

Is there any tips for me to master the song?

Thank you very much!