QT:
As a fellow pianist, I feel that you have an advantage in that you might have, or you might be able to develop, "perfect pitch." This is a desireable natural ability to determine exactly what note is beig played. You either have it or you don't. I do not. So consequently, even though I can hear the piece of music in my head, I cannot figure out (without labored trial and error) which notes to hit on the keyboard.
I had one friend in college who was just like that. He played guitar. He could pick up any guitar, strum it once (open), and tweak all six pegs in about five seconds to put all strings in perfect tune. While I knew him he had been a member of five different bands, totally different styles from jazz to hardcore punk.
So, its a natural talent to take advantage of. Use it for your own enjoyment; or practice a bit and entertain friends at parties; or practice a lot and be a serious musician.