I play a few songs by the Tea Party, and they use some really weird tunings. I found the easiest thing to do was to by a electric chromatic tuner...one that will let you tune to any possible note.
If you wanted to use relative tuning to get to EACFAC, you would start out with standard tuning (EADGBE). The top two strings you would leave alone. The D, G and B strings, you would tune each down two half steps (i.e. two frets). The high E string, you tune down four half steps to get to C.
One other method you could use, if you don't have a tuner, is tune it using a piano/keyboard. For example, before re-tuning, the D-string should sound like the D key on the piano...to tune to C just play the piano's C-key and then tune you guitar down until it sounds the same.
Hopefully this helps.
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