hmmmmm, pinched harmonics........*drool*
Pinched harmonics are great. i find it depends on the type of pick you have. You do need a point on it, but it doesn't have to be that much of a point, just enough (this you find out by practice, i can't tell you how much "enough" is). if, like me, you get "attached" to your pick and don't want to change it until it's been worn to a tiny shred, you will find it hard to get PH's unless you've just started using a new pick, and even then i find that it normally needs to be worn down with a bit of playing first.
Also, once you start hitting them, don't stop. keep practicing at them. i went through a stage where i didn't use them much a few months back 'cos i was concentrating on a new song i was trying to learn. now i have trouble hitting them, although it might just be 'cos my picks worn down too much and i need to change it.
1 more thing, picking hand. when i play them i find that i have to roll my picking hand away from the string, almost like you're digging a hole and your throwing a shade-ful of dirt away once you've gotten one. it's not so exageratted, but its kind sublte. i also find that i have the roll my thumb down on the pick so theres enough of the flesh sticking past the pick to hit the PH. like i said before, though, i can't tell you how much "enough" is, practice will let you know.
anyways! if any of that helps you, then good! if not then sorry for messing up your head.
Hope you can enjoy endless hours of making your guitar squeal just by stroking it in the right way (sounds better if you're guitar is named and you consider it a "she", then you get "make her squeal by stroking her in the right way".
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(Unless you are Zakk Wylde 
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