Greetings
I noticed that you mentioned how you want to be able to play this piece because you like it. To me this is important, should you strive to play something beautifully and as intended by the composer or style, or just play the notes. If you are in for the latter, and I hope you are not, then feel free to start the piece, even in in little sections, and learn all or most of the notes correctly. If however, you are striving to execute the wonderful music, you also have to consider not only the notes, but the sound behind the notes. After all, this is Debussy, and you have to watch out for the nuances, the colour, the shading, and the pedal work is just as thorough as the finger work, so mastering the notes only will not make the piece sing.
However I really see nothing wrong with striving for challenging pieces, just don't spend all of your time on it. Take it by sections and learn the notes first, of course.