to all the guys who are talking about grid trading etc here, and capturing every x pips spikes, reversals etc in a quasi-mechanical manner etc... one simple tool you'll find helpful is the P&F chart... of course that tool will also show you very graphically that other than working on a multi-year timeframe (and with the benefit of 'continued' favourable mean-reverting type conditions), grid trading on tighter ranges simply doesn't work on the forex...
now thats absolutely not to say that some people are not having long successful runs at grid trading / grid trading+ (like, some measure of discretionary etc), but just do some research using those type of charts, play with the parameters in as many ways as you want to 'backtest' as much as you want and i'm sure some things will become clearer...
good luck with your grid trading ;-)