The best place to start is to have a good relationship with your mechanic, and ask the questions and note the answers. When I have an annual done, I have my mechanic thoroughly point out any work he wants to do, and why. The "I never work on it" thing is fine, but the "I just fly the plane" thing is probably not. You want to be able to fly the plane and know why certain things are the way they are.
I'm nowhere near a mechanic, not even close, so you'd be better off with someone like Rich to help. So take all this with some caution because I'm not much more knowledgeable than you, I'm just starting..
But the steering horn can be seen here on page 109 and here at Lasar. . This is for an M20J but I believe most of the mid/long bodies are pretty similar. I was told parts of the steering horn tend to go bad or get bent after a while but it only affects steering, and was told to not worry about it. That said, I had complained about mine for 3 years before the mechanic finally commented that it was pretty bad. After my mechanic in AZ replaced that, Oasis Aero commented that I need oversized bushings and I believe, from what I saw, that's for the Support Truss Assembly in the diagram at the bottom of this page.
I'm told all Mooneys tend to go bad with these parts and they need overhauled in time. Bad landings exacerbate the situation. I'm under no illusion that me buying the plane with 120 hours under my belt, and these two things going bad, are unrelated.