The next step is to run the wires from the footwell to the hole that the interior light is now hanging from. I found it was easier to hide the wires along the dashboard first and then route them up the pillar and over the roof card. To do this bit just line the wire up and pull at both ends. A flat head screwdriver might help to wedge it behind.
Wire goes in at , is tucked behind the black rubber at  and comes back out at .
Once that's done, clip the wire in along the length of the pillar.
Remove the sun visor (2 screws), and you should be able to loosen the roof card just enough to hide the wires behind it and feed them through to the interior light hole.
Rinse and repeat on the driver's side.