Rabbitoh IMO you have to trust the stock your in and have the capital and the patience to ride it out, otherwise, you're just handing over your money to someone else who will inevitable make a killing.
Averaging down on quality stocks is where big money is made IMO. You just need to have patience. Sometimes years of patience.
I never get out of a stock unless I find a better opportunity or the fundamental game of the stock has changed enough that it's not worth holding anymore. Market gyrations is never a reason to sell IMO or you'll get shaken out.
Just my opinon.
* que the "stop losses are your best friend crew" *
