Getting in Tune

Tuning the guitar to Open G is relatively simple. The 2nd, 3rd and 4th strings (B, G, and D strings respectively) are common to both Open G and standard tuning.  Since these strings don't need to be retuned, they will serve as reference points for retuning the 1st, 5th, and 6th strings.  Here are the strings that need to change:

Standard Tuning: E A  D  G  B  E
Open G Tuning:   D G  D  G  B  D

Starting with the open 6th string,