I look at the downwards legs back through a stock's history and get a feel for how far and how fast it can move from the most recent high pivot. Amibroker does most of this for me, but you can just eyeball it. Plot some pivot points on your chart. I like a stock to be ranging or in a long term uptrend - this ensures the nest swing up will be of decent size.
CCL was a very good candidate for a swing trade over the last few months.
Yeah wasn't bad aye!
So you don't actually use much in the way of software screeners instead just look through charts and until you like what you see?
Where do you start?