One guy who just suddenly leapt to mind as "self taught master in his field with influence, distinctive sound, innovation".... is Erroll Garner.
He was a real wierdo - in an extremely good way - but definitely not normal.
Started playing piano at age 3 and grew up in the shadow of his elder piano-playing brother, Linton. (I only know this stuff through my friendship with brother Linton). Erroll was completely ambidextrous, for a start - could sign autographs with both hands and you couldn't tell the difference - could face the keyboard backwards and reach behind himself to play - perfectly - was also known to reach over the piano from behind it (had to climb on top of something to do this, cos he was quite short) and play it that way - also perfectly. And he had phenomenal powers of memory - he used to go along to classical concerts and then come home and play huge chunks of the repertoire he'd heard and filed away uncannily in brain cells..... That sort of wierdo.
But they still never let him in the union for many years because he didn't read music.
(eventually they relented)
Still don't know quite how far to take the idea of being completely self-taught though....
Music was around in the family, just as it was aall round in the Pittsburgh neighbourhood.... among his schoolmates there was Billy Strayhorn, for instance, who was work-horse muse for Duke Ellington, and also Ahmad Jamal, who was a major influence on Miles Davis.... and most of the Miles rhythm sections were local and would hang at the house.... so he definitely grew within the established muso community.... so, while not necessarily being a formal education, that sort of thing, increasingly rare these days, is surely an education of an immeasurably special and irreplaceable kind.
Wes Montgomery didn't read music either - but he, too, had music constantly in the family - the Montgomery brothers were all great.
George Benson didn't know how to read either - though he probably does a bit better now.
Would they be self-taught ?
They all definitely studied hard.
If you can get lessons - take 'em, I say.
But it's up to you to study hard.
As Linton said, "You have to practice everyday..... and you have to do a lot of washing-up!"