Sorry for the loss of your Dad. It takes time.
That sounds like a good strategy. You can also do an
Advanced search on
ebay for what specific items sold for.
Click on "Advanced" at the far right of the "Search" box. Type in the details from the slab in the new "search" box including Date, type of coin, grade, and grading company. (This next step is important to find "Sold" examples.) Check the box next to
"SOLD", and then click on search.
Remember that these "sold" values have fees removed from them (10%-20% I've heard).
I'm simply a collector but remember that dealers are in business and it requires making a profit. The "Gray Sheets" are another resource a lot of them use as a guide for current asking and selling prices on coins. Think of the "Gray Sheets" as an informational "Stock Market" for coins. Simply an up to date/current "Ask" and "Bid" amounts for coins of all types.
Sellers do have overhead, auction or show fees, plus holding it in inventory until the right buyer comes along. You will have to decide about investing your time into listing, selling, shipping, fees, follow up and so forth to get the best return if you sell them yourself. Just remember whichever route you take, there will be good surprises and not so good.
Best of success with whichever route you take. Patience and timing will probably be the deciding factor.
Words of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.