I don't know who the great lawyers are, and I presume you can't get to them. I know of no case where it can be said for certain that they took part. They defend some people, but you can't get them to do that through your own efforts, they only defend the ones they want to defend. But I assume a case they take on must have progressed beyond the lower court. It's better not to think of them at all, otherwise you'll find the consultations with the other lawyers, their advice and their assistance, extremely disgusting and useless.
There's some boring advice for improvisers beginning their careers like "see as much of it as you can and do as much of it as you can. " Volume, in a way, is the most important thing. Not, like, decibel volume - just immerse yourself in it as much as possible. I'd also suggest that you put a high value on your personal interests and tastes.
I certainly wished I hadn't stressed quite as much or had such insecurity at times. I wish I had trusted my instincts on some occasions when I didn't and I wish I had listened to better advice when I didn't. But overall, I have to look at the glass as half full and acknowledge that I am all of the moments of my life, the good and the not so good.