I'd go for JP Martin's video on grading US mint state coins, the
ANA library has copies for check out if you are a member. You can find copies on
ebay like this one from JT Stanton's shop, [eBayItem]380485689878[/eBayItem] (I'm in no way endorsing this dealer, but I've purchased from them previously with no issues).
It's still available on VHS as well usually pretty cheap on
ebay.
"Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013!
ANA Life Member #3288 in good standing since 1981, ANS, Early American Coppers Member (EAC), Colonial Coin Collectors Club member (C4), Conder Token Collector Club member (CTCC), Civil War Token Society (CWTS) member, Liberty Seated Collectors Club (LSCC) & Numismatic Bibliomania Society member (NBS), USMex, Member in good standing, 2¢ variety collector.
See my want page:
http://goccf.com/t/140440