The thing that blows me away is how a film can change from the time its written to post. This magic can compel the unmotivated to an enlightenment of will and the spirit inside the director can bring a film beyond the moon or to its doom. The real talent is in the fearlessness of being honest with self.
you received lots of funding for your film and now you have very cold feet? sounds like you are way over your head anna. it's not your fault, the investor should have done his homework before giving a nice chunk of change to an inexperienced "filmmaker".
They just need to invest in an experience producer to give the director the "controlled" freedom to make the film they all believe in. Problems arise when everyone takes on too many roles beyond their experience or their passion.