Next, pick the string, then touch the edge of
your right hand thumb (the part that is currently closest
to the string) at the point where you found that natural harmonic.
At first, try this as a 2-step process. You will pick, then
touch the edge of your thumb on the string at the point of
the natural harmonic. This is still a touch harmonic, you
are just using the edge of you thumb to do it.
A pinch harmonic is where you pick and touch the edge of your
thumb on the point of the harmonic at the same time. Be sure to
have only a very small part of the pick sticking out from your
thumb and finger, and pick only with the very tip of the pick.
This whole example was using an open string. But pinch harmonics
can be done on any fretted note as well. Since the point where
your right hand will need to pick will vary depending on what
notes you are fretting, you will need to experiment. There are
times when you will hear only the harmonic and other times when
you will hear a combination of the fretted note and the harmonic.
If you move your right hand by small increments to the right
or left, you will get different pinch harmonics for the same fretted
note. This is where the science of pinch harmonics comes in.
your right hand to create different pinch harmonics