It's probably better to look at the notes as flats:

Eb
Bb
Gb
Db
Ab
Eb

So you have to tune you guitar a semitone flat. Every string will be a little lower in pitch than usual. If you have a chromatic tuner then this will be pretty easy. If you can do it by ear it's not too hard either.

By the way, unless you're playing along with the song then there's no actual need to tune this way. The song will sound much the same in standard tuning.