Help MK4 Fiesta Cabling Issues

[Morphius]

I recently bought a new speaker set-up for my MK4 1.4 litre Ford Fiesta and I have no idea how to get the power cable i'm running off the battery into the interior of my car. I don't really want to drill into my wheel arch so if anyone has had any experience of this situation then please lend me a hand!

thanks

Morph