how about jimi hendrix? anyway, if you're planning to be a technical genious on the guitar, you will probably need a teacher and to practice a lot (talking about 5 hours or more a day). it's a great deal about how you practice as well as how much. you need to talk to a teacher and other experienced guitarists for the best way to do this, to make sure your doing the right things when practicing and not falling into bad habbits etc. however, you don't need to be a great guitar player to become famous. you need to be able to compose somewhat original music that will make you stand out. if you manage to obtain your own sound on the guitar then you are much more likely to make it, which is somthing that really can't be taught but has to come from your creative mind (though you will need a good degree of technical talent too). or the other way of becoming a famous guitar player is by creating a band and an image that will make teenagers follow you like gods no matter what music you play (not an option i'm recomending).