Crazyheart, 'To Kill a Mockingbird' was (and remains) one of my all time favourite books. Certainly worth a reread every decade or so.
'Go Set A Watchman' was a big disappointment. I found it hard to believe that it was by the same author and about the same characters. (Well, some of the same characters - some of the main supporting characters in Mockingbird were missing altogether or briefly mentioned in Watchman - one had died, another moved to England, another never mentioned at all.)
I had to keep reminding myself that, although it is set 20 years later when Scout is an adult revisiting her hometown, the novel itself was a first attempt by Harper Lee written some time before 'To Kill a Mockingbird'. Harper Lee never meant for it to be published.
I'm not trying to discourage you - just give my opinion. Go ahead and read them - then keep Mockingbird and donate Watchman to the next used book sale.
ps - I also loved Gone With the Wind and found the supposed sequel 'Scarlet' a big disappointment - but then it was picking up on the same two main characters but by a different author.
Always the role of Attica in the KKK as a mole ... you have to get in there to see what they're up to before you judge ... a wild observation! But could he be obvious about what he was doing virtually?