Just to be clear, I went to piano classes for about two months last summer, and then worked through the ABRSM grade 2 book. I have seen Alfred's book. I know major and minor scales, and arpeggios with correct fingering, as well as major and minor triads, diminished and augmented chords, and seventh chords. I very rarely have any problems with fingering; I have reached a stage where it is pretty "obvious" how to finger most passages I come across, at least in beginner level pieces.
Though I've been playing since just over a year, I have played the piano consistently for over 5 hours per day, and am not exactly a beginner.
I'd like to play something that relatively interesting. Regarding the pieces I mentioned, it took me about 2 weeks to learn Fur Elise (it took me some time to get the coda right, and it was the first piece I attempted to learn completely), and about 2 weeks to learn Nocturne Op.9 No.2. As far as technique is concerned, I did not find the nocturne difficult at all. It was rather hard to memorize due to the complex musical structure, though.
In general, of course, Chopin arpeggios are difficult, but in this particular piece, I found them quite easy. I feel quite in control the dynamics during the left hand leaps. I used sustain pedal as it was indicated in the notation. Could you specify where did you had to use finger substitution in the arpeggios? I must be missing something here.