i've been playing piano for almost nine years, since age 7. private lessons with a nun (figures). lessons aren't really necessary unless you want an in-depth understanding of theory and advice on tempo, emphasis, etc.
if you can read music, then you definitely can teach yourself to play. when you take lessons, you're essentially teaching yourself to play...just in the company of an instructor. practice often and you'll get the music down.
i'm currently teaching myself vanessa carlton's "thousand miles", and i've taught myself dozens of other songs. it can be done, dude.
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