Editing problems

Once me and my group had finished editing our music we were told we should then over expose our music video which seemed odd at first but we still went with it. As we finished completely editing our video we were then told that we would have to edit each cut scene one by one, meaning that it would take a very long time to have our whole music video over exposed as we couldn't over expose it as a whole, each tiny scene had to be individually edited. This starting fleshing red lights in all of our eyes as this is a highly time consuming job. It wasn't even a choice to not over expose our video as this was something we were heavily relying on to make put music video how we wanted it to be. At the end of the day we have now learnt to NEVER do this again and we are going, and if anyone every has queries on over editing that they over expose before cutting everything to save valuable time.