Sam Taylor-Johnson likens directing 'Fifty Shades of Grey' to walking on a knife edge

Fifty Shades of Grey helmer Sam Taylor-Johnson has admitted the movie has been truly challenging and she feels wrung dry after directing the flick.

In a magazine interview, The 47-year-old director said she is literally going out of her mind and has seen the film over a thousand times is now feels like a blancmange, the Daily Express reported. She continued that the nuances within i.e. the tiniest shift look, blink of an eye, etc. can make all the difference and flip it into the wrong territory and it was like walking on a knife edge.

The Nowhere Boy director said that she wanted to protect her vision and that's the hardest thing as there are so many voices.