What I've discovered about intraday trading (at least for me) is that execution = 80%, prognostication = 20%. Many days I will come in thinking the market will trend one way or the other, and I might even be correct in retrospect; yet because of a few early mistimed entries, I will find myself constantly chasing when the market goes the way I "predicted" (fear of missing the move I called) and then getting shaken out too easily on the slightest pullback. Conversely, some of my most profitable trades started out as just scalps, but whose stops were never hit. What this means to me in practical terms is that even if I think a stock should go higher, if I see quick hard spike up, my instinct on risk/reward will automatically signal "fade", and will cancel out if not completely override my original idea. I know it never feels good to see a pre-diagnosed move leave the station without you, but sometimes you just have to let them go -- I learn this lesson the hard way almost everyday. 
Looking to short a break of the lod is usually a good idea, but can be risky if it comes after 8 or 9 down candles on the chart -- then it usually ends up being just a target for shorts to hit and cover into.
I have to say though, I take back my facetious comments in my last post; today's SPY chart looked like one hell of a monster to trade. I count 5 break-and-reverse lod's before the final fall -- ugh! Agreed with Nihaba, coming out ahead on a day like today is quite an accomplishment.

Looking to short a break of the lod is usually a good idea, but can be risky if it comes after 8 or 9 down candles on the chart -- then it usually ends up being just a target for shorts to hit and cover into.
I have to say though, I take back my facetious comments in my last post; today's SPY chart looked like one hell of a monster to trade. I count 5 break-and-reverse lod's before the final fall -- ugh! Agreed with Nihaba, coming out ahead on a day like today is quite an accomplishment.