It worked for Steve Jobs!
“try to understand the issues yourself”
Your contractor is a skilled professional, not a drone. You need to exercise good judgment if you’re going to make decisions.
But that’s easy with a doctor you have a long term relationship with. I imagine it’s different eg. if you get cancer it’s probably going to just be a part time job to keep informed on all the doctor’s recommendations, and getting second opinions sounds like it would be time prohibitive. I don’t know of an easy way around this though.