How to avoid accidental hook ups?

[flynewb]

I've just started nymphing with 2 nymphs. And numerous times i have hooked into a fish on it's sid or on a fin. I've read where as you become more experienced with this method it doesn't happen as much. But i'm not doing anything different than what a seasoned nympher would do. I see the indicator go down and set the hook. Does anyone have tips on advoiding it if possible. I'd rather not even catch a fish.
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