Hi, be warned this is a difficult piece, probably one of the hardest preludes he wrote I think, I have not attempted it yet, but I consider it a great piece with the most beautiful middle section involving the theme in the left hand with all those double notes in the right, sublime music.
The left hand needs a lot of attention yes, but so does the right hand to master the double note semi-quavers, not easy. I heard from the famous english pianist peter donahoe (not sure about spelling) that this piece requires huge virtuoisty. I hate those left hand runs throughout, you need to just go for it.