@whitestix I am going to suggest the harder task, but with possibilities to be the most remunerating for the efforts.
I assisted by buying some audio equipment at a estate sale.
The Widower, a Lady had been made offers for a Classic Collection that was turned down as it was quite short on what her thoughts on a value was.
I learnt there were Grandchildren of a age that could assist ands encouraged that the family assisted with recording the EAN Numbers on the Album and then current prices could be checked out with ease.
At a later time I was contacted and thanked, as some Albums were selling for the similar to the dealers offer.
Jazz is big in all Countries and certain Albums are big ticket.
https://www.valueyourmusic.com/most-valuable/vinyl/all-time?genre=jazz