Well written and good advice Ed. I learned much of this the hard way when I had take of my father in the last three years of his life when he was suffering dementia.
I am single and have a child who has little interest and no real knowledge of collectable firearms.
My "solution" was to leave all my firearms, except one three generation heirloom expressingly identified as such, to my alternate trustee of my trust. He is a life long friend, hunting partner and shooter and collector of fine doubles. He is also who I want to have my guns if I should pass before him. he can cherry pick the collection and add to his own and he will have an understanding of value of what is to be sold and he will be the recipient of the proceeds. My intent is to leave my dughter things that will be much easier to appraise such as real estate, cash, bonds and equities.
