Description
Before I go any further I should probably talk about string gauge. If you want to get your guitar to function properly in this tuning you're going to have to go big. That means getting a thicker set of strings and probably getting your intonation and action set as well.
I always recommend going to someone that does this for a living but if you have experience and feel comfortable then go for it. The bottom line is if you don't increase the string size, then your chords have a tendency to go out of tune when you pick. Another tip is to go for a bit longer neck length as well. It helps in getting the proper tension on the strings. This can really make a difference to how well your guitar will stays in tune!
The neck of my guitar is 25 and a quarter inches. I usually buy a package of strings for a 7 string guitar, and just toss the high E string and use the rest. The gauge I have on now for this is:
6th=58
5th=48
4th=38
3rd=28
2nd=18
1st=14
Now we're going to tune the guitar to Drop C. This will be like tuning the guitar to D standard and then lowering the 6th string down a step from D to C. Here's what each string should be tuned to:
6th=C
5th=G
4th=C
3rd=F
2nd=A
1st=D