Pinch harmonics are prformed by playing a note then diggigng into the string with the side of your thumb at the same time...this might sound difficult but its not really a great tip is to find out on your guitar where harmonics sound best e.g on my guitar its easy to play pnch harmonics on the 5th fret 6th sting(A) directly in the middle of the neck humbucker hope this helps if you need further clarification please let me know.