I was recently directed to a site called artisthousemusic.org after searching for video footage on Kenny Werner. Within the site, I came across a wealth of video footage from many musicians and teachers giving some great advise for aspiring student aiming to reach their higher goals.
This video link shows a lecture by the fantastic Kenny Werner talking, amongst other things, about attaining freedom within improvisation –
There are more videos on this by Kenny including some footage of him playing. Even if you aren’t into improvised music, his advise covers performing within any style of music and I would consider it invaluable for all.
Enjoy!