ahhhh Gershwin. Never let anyone tell you Rach 3 is harder than Jazz piano in general. It's not. I listen to Jazz pianists in awe everyday (I've played "classical" for 19 years.) . For me it is a dream to be able to do what Monk, Peterson, Gershwin et al. do/did.I recommend you learn it.
I much prefer Gershwin's Concerto in F ......... If you don't know that work, you might want to listen to it before you delve into the RIB (which I dislike).
Me too. I used to love Rhapsody in Blue when I was younger but after discovering the Concerto in F that's my definite Gershwin favourite now. I have a music minus one copy of Rhapsody in Blue which I have a go at now and again but am learning the Concerto "properly". Good luck with it though