This guitar trick is a variation on artificial harmonics, which itself is a variation on natural harmonics. The natural harmonics are most commonly played on the 5th, 7th, and 12th frets. To play these, you lightly press the left hand on top of the fret without pressing the string to the fret. Then, you pick the note. To make an artificial harmonic, you regularly fret a note with the left hand and then use your right hand index finger to lightly press on that string twelve frets above the fretted note. Then, you pick the string. With this technique, you have to hold the pick between the thumb and middle finger. Finally, to play harp artificial harmonics, you alternate plucking a note using the right hand ring or pinky finger with picking artificial harmonics. This creates a harp-like sound! This technique works well when you can fret a chord using four or more strings without repeating any notes. The video below shows the great guitarist Lenny Breau describing how to accomplish this:
There’s plenty of people with small hands who play the guitar. Nine times out of ten smaller people confuse the terrible awkwardness that comes with the first week of playing the guitar and mistakenly think it’s because their hands are small. Again, you’re teaching your hands to do really strange movements here. Imagine going to an advanced yoga class having never stretched before, that’s basically what you’re doing.
While there is something to be said for learning in this way, it is by no means the quickest (or most effective) way to learn how to play guitar. In fact, you may find that you end up missing out on a lot of the fundamental information that you really should have as a guitar player. As a result, it is not surprising that online guitar lessons are now becoming extremely popular.

This is easier than it sounds. Each open guitar string is the exact same note as the 5th fret note of the string before it. Therefore, the open 5th string (A) is the same note as the 5th fret on the 6th string (also A). If it is not, adjust the tuning key for the 5th string until the open string note sounds the same as the 5th fret note on the 6th string.

4.) Check the guitar’s string height by pressing down on the first, second, and third fret. You should be able to do so with minimal effort. Come to the 12th fret and press down. The distance from the top of fret to the bottom of the string should be no more than three times. If it is five times, the guitar may have a warped neck or too high of a bridge.