That's easy. We use our trend identification tools FX Multimap which shows statistical strength/weakness and also FX Power Index which shows % of currencies that support buying/selling.
IF on the pullback to the fib level there is not much weakness on these tools and the previous move up had HUGE strength then we look at the 38 to 50% fib level to buy and the EXACT entry is when trendline over the highs gets broken! Reverse for shorts. Call us and I'll give you a week of our classes free.