OK, so how do I get through the VX firewall?

I recently purchased 4 Hella Rallye 4000 lights, which are already mounted to my custom light bar. The plan is to run the wires back along my roof basket, through a hole yet to be drilled in the center mount of the roof spoiler, down, through my head liner, down my driver's side A pillar and into the switch, and also through the firewall to the battery.

Tips? Pointers? Options?

Sunday is the day I plan to tackle this.

Thanks - Bart