Having admired Eric's wah pedal at band practice, I asked for one of my own (and ordered it myself at their request.) Some of these pedals come with significant bells and whistles, but I just wanted a very basic model, and ordered a Dunlap Crybaby Wah Pedal.
It couldn't be simpler - when you step on the pedal and hear the click, you then move your foot up and down and get a varying "wah" sound. I like it a lot, but I still need to really get comfortable using it in a solo. I'm thinking about my hands so much that I need to be able to use my foot without thinking about it.
I'm not ready to bring it to band practice yet. But with more practice, hopefully soon.
