Elle, you should've seen my face when they made that hair line comment to that poor paralegal😭
I had the same issue struggling with interrupting partners as they can have so much aura. What I did that seemed to work was when initially getting introduced to them by my supervisor, I would ask whether they were free for a coffee at the end of the day or tomorrow. I would then use that coffee chat to really get to know them and try to build rapport. After that, it became a lot less scary to ask them about their work.
On that note, I would say to always ask if you're interested as a closed mouth doesn't get fed. If you don't ask you definitely won't get anything from them but if you do ask there's always a chance they'll be happy to walk you through things. One time, I overheard a partner talking about a scheduled client negotiation over the phone, After his call ended I asked him about it and cheekily suggested that it would be a great learning opportunity for me if I could sit in and he actually ended up bringing me to the negotiation. I might've just been a piece of furniture during the discussion but it was a really interesting experience that I wouldn't have gotten if I hadn't asked!
I do already have a TC so feel free to ask any questions you have. Best of luck to you too!