I tried a wah pedal before, but not knowing the right way to use it, I sold it. Would someone elaborate on a auto wah, and how to use a regular wah in a metal solo? Would you turn it on and leave it at a certain level, or heel toe it through the solo.

I am just looking for a little Kirk Hammett type wah on a solo, not much, but just the light presence of a wah. Suggestions?
when i use mine, i tape 6 picks together and put them under the heel.so when i go to a solo i push it all the way back and dont have to find the sound i like. then in some areas ill push forward and back to make that wah sound.