First you might not get a good teacher. He/she might teach you in a way that you don't really like and therefore makin' you not want to play (maybe). Secondly, it really cost a lot to take decent lessons (well, as far as I'm concern). Generally, surfin' the web for guitar info should be enough (if you pay enough attention to what your doing and what your doing wrong).
Yes, share your experience with other player will definitely help you out, but make sure they know what they're doing. I learned most of my music theory at my guitar teacher but that's not the only way and surely not the best way(hehe) to go.