I had a few guitar lessons when I was 8, and then in my infinite wisdom, decided I knew enough and quit. In junior school, I could read music to a degree. Then at 16 I got a friend to show me a few guitar riffs of the metal songs I was just getting into. But at present, I can't read music. All the rest is self taught.
I am aware of the "you have to know the rules, to break them" philosophy, but I've always gone purely by feel. If it sounds right to me, that's all that matters. I know a lot of people who are masters at music theory, but fall down in the actual delivery of the art (of course, then you've got f*ckers like Joe Satriani who've absolutely mastered both theory and the delivery
When it comes to just releasing songs, I feel I have no need at all to know any specific music theory. But I want to get into writing soundtracks (getting paid to write soundtracks - I've written them before, but for free). I'm wondering if it's possible to use programs like Sibelius to cover making the compositions a reality, and getting the Sibelius output proofread by a proper muso...