Everyone has their own techniques; you need to find YOURS. The best way to learn, is by the DVD "The Art Of Screaming". It's how I learned! You can buy it here: http://www.amazon.com/Art-Screaming-DVD-Audio-Cd/dp/B001E09DQM/ref=sr_1_7?ie=UTF8&s=dvd&qid=1235137031&sr=8-7
Hope that helps!