Mozart Piano Concerto #21 In C Help!

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Hello there! 

I'm having some real difficulty learning this piece. The trouble I'm having relates to the fact that the left hand plays in triplets whilst the right hand plays in 1/8 notes. I have no trouble playing the two separately but when I even try to piece it together it falls apart! It's like patting my head and rubbing my belly, I just simply can't do it.

So! I'm wondering if anybody has any tips to ease me into being able to play something such as this? I really would love to learn this piece but the 'asynchronous' playing of the hands really has me frustrated. Any tips out there? Thank you so much in advance