One More Thing: A Word about Alternate Tunings
If you ever play your guitar in alternate tunings, like open D, or DADGAD, then you know that in most
alternate tunings, some or all of the strings are tuned down by a half note or whole note. This has two side effects:
Therefore, if you do your setup in regular tuning and then go down to an alternate tuning, you may
find that you're getting the dreaded buzz. So if you ever use alternate tunings at all, you may want
to do your setup work with the guitar in the "loosest" of your alternate tunings. Or, if you'd rather
do the setup in regular tuning, you should aim for an action that is a little higher, like 5% higher,
than what you would need if it weren't for the alternate tunings.
Since there is less tension on the strings, the neck does not get pulled forward as much as is
the case in regular tuning. As a result, the action (distance between the strings and the frets)
will come down a bit all the way along the neck.
Those strings that have been tuned down will tend to swing out a little wider when you play them,
again because there is less tension. That means they'll be more prone to buzzing.