Fantisie Impromptu

I am working on a song by Chopin that is simply gorgeous.  But really really hard. I can't even began to list all  the things that I have to remember while playing. Here is the best song I could find of it:

This one is also cool. I have been working on it for maybe five months and I am still no where close to this. It is really hard. There are so many things that seem unimportant that make the song amazing. 
I practice it for maybe 40 minutes.  It is one of the most changeling pieces I have ever worked on.