Hi, I have a UK 2002 Accord Sport and looking to wire a sub and amp.

I have all cables in place apart from the live wire that needs connected to the battery. How do I get through the firewall?

Does anyone have an idiot-proof guide or some detailed photos?! I've had a look but couldn't see anything...

Sorry for the newbie question

 

my build log has photos of my power wiring - including passing through the firewall through a factory unused grommet located above the gas pedal.