The technical difficulties of the hardest sections in the Ballade are similar to some of the etudes, so if you can play a few Chopin etudes than you can most likely handle it. To gain an understanding of Chopin's musical style and how it should be interpreted, you may want to study a few of his easier pieces first (Nocturnes, Waltzes, Mazurkas, and so on).
Finally, there's the length factor. The Ballade is about 10 minutes long and fairly difficult throughout, and many pianists haven't yet tried to play anything of that scope. I wouldn't try to tackle it unless you have played some other long pieces (10+ minutes) so that you know you can get through a piece that long without becoming technically or musically exhausted.
Disclaimer: I've played through this Ballade a few times and worked on it a little bit, but have never fully learned it. I feel like I have a decent understanding of it, but you might want advice from someone who has really played it.