Liszt's Un Sospiro is one of the most beautiful pieces of music I have heard. I greatly enjoying listening to this piece. I would love to be able to play it one day, but I know it is very difficult. I was wondering approximately how long it would be before I could attempt this very difficult piece. I started piano when I was 18 and have been playing for close to seven years. Here are some of the Classical pieces I have played (I play many hymn/sacred arrangements, but those are of a different nature so I am only including Classical pieces):
Bach Two Part Invention No. 9 in F Minor
Bach Three Part Invention (Sinfonia) No. 5 in E Flat Major
Bach Prelude and Fugue in A Flat Major from WTC Book 1
Beethoven Sonata No. 9 in E Major Op. 14 No. 1, First Movement
Brahms Rhapsody in G Minor, Op. 79, No. 2 (Currently Learning)
Chopin Nocturne in B Flat Minor Op. 9, No. 1 (currently learning)
Chopin Nocturne in E Flat Major Op. 9, No. 2
Chopin Etude in E Major Op. 10, No. 3
Debussy Ballade (currently learning)
Debussy Clair De Lune
Debussy Golliwog's Cakewalk
Debussy The Snow is Dancing
Mozart Sonata in C Minor, K. 457 (First Movement)
My teacher has suggested pieces for me such as Bach Preludes and Fugues, Malaguena by Ernesto Leucona, some of Mendelssohn's Songs Without Words (which I love), Chopin Nocturnes (which I also love), Toccata by Khackaturian, the Revolutionary Etude by Chopin and Chopin Ballades (both of these last two options seem to be very difficult, although I am not exactly sure how they compare with Un Sospiro. I am sorry for the rambling and do not want to seem like a troll. I am simply curious at what point it would be appropriate for me to attempt this piece (Un Sospiro).