Cast net experience

I know cast netting is illegal in many parts of Colorado, but its basically open season out here. I'm going to be buying a cast net soon to get into some good, free catfish and striper bait.

Does anyone have experience throwing one? I've been watching some instructional videos and have seen some insane methods, including some that involve holding the lead line in your teeth while throwing. Yikes...

I'm thinking about starting with a 6' radius cast net... 12' diameter. Will be going after chubs, shad, and sunfish.

Is this going to be a sufficient size? Any particular method you would recommend to a beginner for getting the perfect circle without putting the damn net in my mouth?