Hows your ear?
Ive been playing piano for about a year now. the only thing I ever read is how to use my fingers to maximise speed, and the genral run of the mill 1st, 3rd, 5th chord position. Through making myself practice I soon learnt everything I needed.
Having a good ear is very useful, I think everyone must have a tonal sence of which note playes well with another, And I used that to learn scales. just through trial and error. saying that Im an individual who learns far better by myself from making my own mistakes, opposed to somone who learns better by been taught them selves. I think I can bang out a good clasical piece, maybe not as perfectly played as a 10yr trained pianist, but Im one who belives a song is alot better played with perfectly convayed emotion rather than a perfectly timed hand movements.
I Learnt best being self taught, (also because I couldnt afford lessons). But you may learn better with a teacher. That said and done I would say getting taught by someone professional would be a hell of alot better then any book. but if you want to teach your self, then you need to really love the instrument and have the determination to make your self do it, even by practising 2 hours every night. or else you will just drop it in a week.