Wear to drill for amp power

[MadManAndrew]

You don't have to tell me how stupid I am because I already know, but my power cable for my amp is currently run behind the FL fender amd through the door seal into the cab, and everytime it rains the interior of my truck is getting wet, smelly, and fogging the windows up. So now I need to do what I should have done in the first place: drill through the fire wall.

My problem is that the only good places I can find to drill I cannot fit my drill in. So does anyone have a good place to drill?
Posted via Mobile Device