Well, my first Liszt piece was La Campanella (just this year actually), and I actually finished it.It depends how much you are willing to work on it.What other difficult repitoire have you played?
Well, in the past year I've worked on Beethoven's Pastorale, Op. 28, the Brahms G Minor Rhapsody, Chopin G Minor Ballade, the Butterfly Etude, the Bartok Sonata, Improvisations on Hungarian Peasant Tunes, etc.