It's in an up-trend, markets can stay irrational, for longer than you can stay solvent. Short weakness when you see a break in the bottom channel of a trend line. Right now we're still having higher highs, and higher lows. I don't want to chase, or short this stock. Only on a breakout of the bottom channel will I make a move on this chart, by shorting. But, on the bottom channel I'll have a buy order, and if it still breaks through. I'll have to stop out, and re-enter with a short entry. If it bounces off the channel, I'll earn 3-6% on a multi-day swing trade.
This is what they mean, by having a trading plan. Have a well positioned entry, and a poor exit, and you'll make money. If you have a poorly positioned entry, and a well planed exit. You'll still lose money. Have a plan, not a hunch.