On OPEN HFEs I judge my stop by the nearest S/R, but never risk more than 40 ticks. The nearest S/R is usually the high or low of the highest/lowest candle. If the trade requires that I risk too much, I skip it.
There never was a moment, and never will be, when we are without the power to alter our destiny. This second, we can turn the tables on Resistance. This second, we can sit down and do our work.