It is all about learning and experience. The best option to know more about a pair is to observe the pair regularly. What most traders do is they always try to find the entry. But no start to observe chart to learn the market, to learn that specific pair. By doing this you will find some unique characteristics of the pair. I'm currently trading with XeroMarkets, a regulated ECN broker. It provides ultra low spreads starting from 0.0 pip. It also has advanced trading platform that executes trade instantly.