When I was 12 years old, I "studied" the Nocturn post. in C sharp minor (Chopin) and played it in public. Quite nice, I think.
Now, 62 years after, I am yet "studing" the same Nocturn and I dont feel I play it perfectly...
Perfection is a dream... a dream we cant reach... it is allways possible to play more perfectly... untill our death...