How in the **** do you tune a bass like Job For A Cowboy to Drop C or CGCF?
I needs to know
1. Tune the 4th string to the 3rd string, 3rd fret.
2. Tune the 3rd string to the (retuned) 4th string, 7th fret.
3. Tune the rest of the bass to itself (5th fret relative tuning).

There. It's easier to use a keyboard or a chromatic tuner, but if you have neither, this is how. And it's good to use thicker strings.

Ibanez SR506BM
Ashdown Little Giant 1000w
Peavey TVX 115+410
A big ass upright