To further extend my concept...You can also play around with this...
High gain is critical for this considering harmonics ring much better...
1) Fret at the 12th fret with your forefinger...
2) Lightly touch the string above the 17th fret with your left hand pinky. This will seem kinda odd initially.
3) Now, pick normally.
4) After the note is sounded raise your pinky that you fretted the harmonic with.
Blammo! You got it. This is weird way to go about getting harmonics but if you sink a little time into it, it's not that difficult. Always remember: think outside of the box and left of center. And focus on the total package of musicianship. These kinds of tricks are useful in adding color to a lick or phrase - but, do not use them as a crutch to make up for lack of skill in other areas. Broad stroke make a beautiful painting but the blending of all elements bring the painting to life.