Just take it slowly and perfect one thing at a time. Try the easy bits and then ignore them and work on the hard parts. Then try piecing little bits together and WA-LA!it'll sound great if you give it your best!!Good luck
Thanks everyone for the tips and encouragement! I practiced some more and I feel confident that I can bring FI up to a level at which I'll be satisfied.A question: when you play the piece fluently, do the hands more or less feel independent? 'Cause this is really scaring me. Even if I'm rubbing my stomach and patting my head, I feel like the motions are coordinated, in rhythm. Or if I'm playing some Bach invention, and each hand has its own voice, I feel like I can see how each part fits into the whole. But with this 4 on 3 thing, it's almost as if I have to be able to be two people at once. And even with the two hands coinciding 4 times a measure, I feel like I don't have any control over what's going on most of the time. Perhaps this is just because I haven't played much music at this level yet....