Q&A for How to Tune a Guitar Without a Tuner

One of the easiest ways to tune your guitar manually is to find a reference note for E. Match that pitch to your lowest string, then play that string with your finger on the fifth fret. Compare that to the pitch of the open 5th string, which is the A string. When those notes are identical in pitch, fret the 5th string at the 5th fret and match it to the open 4th string. Keep doing this down each string. The only string that's slightly different is the second string, which you'd match by fretting the 3rd string at the 4th fret.

It's standard to refer to the string order from lowest (thickest) to highest, from right to left. So EADGBE is correct.

Yes. An E on the piano should be an E on a guitar, or it's not an E anymore. You have to make sure it's the right octave, however.

The main methods are finger-style (using your fingers or fingernails to pluck the string) or flat-picking (using a pick to strum the strings).

It's hard at first, but you'll get better with practice, because your ear will improve and so will your knowledge of how to do it.