I've been on a mission lately to unlearn my crappy half-remembered "versions" of hoary old dadrock classics with proper video lesson enabled renditions. Youtube makes this so much easier than it were in my day.
I was (still am) such a lazy arse. I'd figure out the general gist of a thing... say, Little Wing for example at the age of 15 then just sort of fluff, bluster and bullshit my way through any tricky bits I couldn't be arsed to sit down and really work out. And there it sits in my arsenal of half-remembered, wrongly played "versions" for nigh-on 25 years.
Anyway, Little Wing took about an hour of concentration and contained several incredibly satisfying lightbulb moments. The relief and sheer satisfaction and finally having got all the little bits right after 25 years of having the shitty approximation in my bag o tricks is serious payoff.
Of course i'm never going to play it in public because y'know... Hendrix. Don't want to be that guy do we? But still.