Used the Nettica presents to create Host A record for thomaspmbarnett.com and an alias CNAME for www.thomaspmbarnett.com, linking both to the appropriate
Squarespace addresses.
When I check the set-ups at Squarespace, I get an incorrect mapping response for now, but I only made the change around 0830 and it can take up to 24 hours to work its way through the Web.
My assumption right now is, I don't have to do anything more to make this happen. It will just occur sometime in the next 23.5 hours.
So cross your fingers!