play Nocturne Op. 9 No. 2 by Chopin

After years of ‘abstinence’ in playing piano, I want to learn this piece.
I have done about 90% of it, but far from perfect, because this song uses “Tempo Rubato” (from wikipedia: “Something like the singing of a good vocalist accompanied by a poor blockhead who hammers away in strict time without yielding to the singer who, in sheer despair, must renounce all artistic expression.”)
which is very hard to master..