That's always the ideal; my take is that I think of a dip as a low point between a drop before and a surge after. 
If we're at the dip we can only see the drop before because the surge after hasn't happened yet. OK, maybe if a traders is super intuitive, or lucky, or maybe if there's a steady pattern--
<-- but for me at least there's never an guarantee that we'll see yesterday's pattern tomorrow. Fortunately our good news is that there are soo many ways that someone can make money by just doing hard work of seeing where effort pays off and where it doesn't.
The way strategy results seem to change from time to time and person to person means that hard/fast rules don't work that well, but heck if was too easy it wouldn't be fun!