Hey,
i took 3 months to get this piece. Its not really that hard. well i played ondine first, and jeux d'eau is considered easier than that. Actually some parts in it are quite hard, like the central part with the chromatic runs, was the part that gave me most of the problem. The hard part lies in creating the tone color, as in most of ravel's other pieces. Otherwise its not that hard a piece. Even when you have got the notes all right, its gonna take a while to create the required tone.Good luck.