Trading only an amount that is 1 to 1(or less) with your capital. Ask yourself "What got Bear Stearns in trouble?"
I believe that ES will have just one chance to reverse to the upside today and it must occur in the next 25 minutes before the end of this 60 minute bar. Otherwise, the market would most likely be lower into the close.
I understand why you made this trade from action on the 2 minute chart, but I think it has a low chance of survival for extended gains. Good fortune to you though if you have indeed found the bottom!