I don't believe I said it here, but the tactic can get used with roads to your borders everywhere, and using your capital city instead. It might work out best to
1. Expand out like you would in any lower level game.
2. Plan to pillage all squares directly adjacent (next to) to your capital.
3. Ideally you want to find as many AIs as you can that have an extra luxury or resource. You only need one though for this to work though.
4. Have either 3 workers if not playing industrious or 2 workers and a warrior on a square next to your capital.
5. Road the square next to your capital.
6. Set research and luxuries to 0% and maximize your economy. This means all tax collectors in all cities if you don't any have markets. If you have markets, you'll need to figure out whether tax collectors or working squares maximizes the appearance of your economy.
7. Ring up your neighbor you can trade for an extra resource or luxury.
8. You give them: gpt. DO NOT TRADE A LUXURY OR RESOURCE.
They give you: a luxury or resource AND as much tech as you can get/want.
9. The warrior pillages.
10. Play as usual for the rest of the turn. Repeat steps 5. through 9. on the next turn.
Once you get the feel for working with 3 non-industrious workers and 1 warrior, you can use the basic concept here with 6 non-industrious workers and 2 warriors to do as LordEmsworth suggests. Of course, you can do this from the beginning, but I'd recommend on practicing the basic steps here once or twice first before you do that.
Lord Emsworth said:
If you devote a few more workers to the task of rebuilding the trade route(s) there is really no reason why you couldn't be importing luxes from your target civ for the happyness benefit(s) on the interturn. Any money that you pay will end up back in your pockets before long anyway.
And besides, it would prevent the AI from trading away your luxes to somebody else, and an active deal where the AI gets money from you *might* lower the chances of certain ... ideas.