I started about 8 years ago. I wasn't really dedicated for the 1st two years (i.e. i just learned songs i wanted to learn, when i felt like playing). My first song was Nirvana-Smells like teen spirit. After i got into metallica i started becoming more serious about guitar playing, i started practicing scales and started learning music theory. When i was about 14 i became really serious about guitar playing, i practiced for at least 2-3 hours a day (on weekends, i had the guitar in my arms all day, i used to noodle even while watching tv). By this time i was listening to Yngwie Malmsteen, Jason Becker, Dream Theater, Symphony X etc. (i.e. guitar virtuosos), and all i did was practice stuff like scales, sweep arpeggios, spring skipping, legato etc. (oh and i also began sightreading). By the time i was 16 i could play almost anything by any of these guys (if you don't believe me, i'll post up some clips i recorded when i get back home). I stopped playing about a year and a half ago... stupidest thinhg i've ever done.... I was planning on becoming a session musician to get some money while i do uni, but i'm not good enough anymore.... Hardest song i could play? Hmmm, most technically difficult would probably be Seranna by Jason Becker (crazy sweeps in that song), but by the time i'd finished learning it i could play it without even thinking... the hardest song for me to play would probably be Metropolis pt 1 by Dream Theater - that middle section is killer.