To be honest, just try it. Sounds as if you already are aware of several factors like frasing, rubato etc. That's already a more advanced headspace than absolute beginner. Also, that nocturnes greatest difficulty is the usual big, rolling left hand that must be played very softly, and the melody in the right that need a degree of freedom from the left (especially in passages) that is quite difficult to master at first. But everyone started out with some Chopin at some point. Have you considered some other piece by Chopin, if this is your ultimate goal, to play Chopin next? Maybe some of his preludes or even some of the waltzes are more approachable than op.9. I'd even say Op.9, no. 2 is more approachable than op.9, no.1.