I agree Steve that it is possible to come up with a strategy from publicly available info which will trade consistently - but it sure took its sweet time with me (like several years).
I bounced around several methods which often had good entry triggers and maybe even good exits. But that still didn't help until I figured out the feel of it, which comes from trust, which comes from experience. Bouncing back and forth between strategies with varying win loss ratios and expectancies was quite the tuition money as I was bailed at the drawdown or cut the winners short considering the underlying strategy.
Look at Woodies CCI. Every moderator has a different way of managing the trade - very confusing. Maybe I was a little stiff, but I needed handholding in one particular way, see it work, - and then finally understood what it should feel like.
For me that was the hardest part in becoming consistent.