In recent years I have been the recipient of bits of a number of peoples collections.
The general procedure which seems to work is trusted friend(s) sell the stuff which is worthwhile to contribute to the estate and then divvy up the remainder.
I have trusted friends lined up already to do this, as the last thing my wife would need is to be sorting through my accumulated decades of stuff.
My father (who is still around) is just doing this for one of his friends with end stage cancer. Different hobby, same process.