I practiced obsessively. I still do (just ask my kids - my dog!!! - my wife!!!!). I am willing to take chances. I also find it helpful to be very introspective about practicing. So, there is a huge element of being self-taught.
I have had some amazing teachers each of whom impacted me a great deal.
Neil Dunlap
Eddie Brauer
Bill Bay
Joe Daley
Gary Smith
Adolph Herseth (ok, this was for one three lesson which I'll never forget)
Richie Corpolongo
Alan Swain (my current piano teacher)
Now I will argue that, ostensibly, we are ALL SELF-taught in any endeavor. A "teacher" is only a guide - a coach. However, the actuall teaching and learning is self administered. There is plenty of educational theory out there that supports this notion.
Finally, Mike said a mouthful when he said you;ve got to LOVE this!
I just LOVE playing. All my professional work is all in support of my playing. I could do it all day 24/7.
OK, time to practice!
Nick