Thank you all. It's worked!
It could have been the firewall (thanks zhadoom), but was more likely my Local Area Connection properties not set right. I tried a few things and something worked.
The guide is great! When hacktrix2006 said it was a "draft", I though it might be kind of incomprehensible, but it is very well presented and clear. Previous posts in this thread had almost got me the whole way, but hacktrix2006's guide would have been sooo much easier to follow from the get-go. I really appreciate the fast replies and help. Can't wait to test this TP-Link on VDSL in a couple of days.
I would recommend posting your guide as-is hacktrix2006. In my humble view, it is more than polished enough.