You're welcome! The most important takeaway, I think, is that to a certain degree, "in tune" is a matter of opinion (for fretted instruments, anyway). You can significantly change the tonal quality of the instrument while remaining "in tune". That's the neat thing about the James Taylor video... follow his method, and your guitar suddenly gets that James Taylor sound, very rich and resonant.

Try experimenting with modal tunings like DADGAD, too. It's much easier to get them "in tune", and you hear this beautiful resonance that guitars can make.

I brought this up on Facebook, and a friend who is an excellent player responded with his own tuning method. He tunes the A string to a reference (tuner, piano), and then tunes every other string to a fretted A note that is in tune with the open A string. This is probably more "in tune" than the highly resonant approach that I use.