I don't know if you're aware of it, but Guitar Pro 8 is an excellent tool for guitarists, for composing, recording and/or learning. I've just looked up this piece (I'd never heard it before...), and there's a GP version, which I've just run through with Guitar Pro 8. In standard notation and tab, the playback speed can be varied (I just played back the solo at 10%...) without pitch change, repeating any section at will. I've attached the GP3 file I downloaded from t'web; maybe it can help..? Yes, the secret is to do it slowly, in manageable chunks, and, with practise and Patience, it will all come together. That's how Randy Rhoads got to play that way, that's certain. Hope this helps...
Douglas
osbourne_ozzy-crazy_train.gp3