Total Immersion - trust the process.
This is not shameless self promotion, just fact and proven methods. Here's a swimmer, Kelly Adams, taken from zero to hero in five short months, finishing second in her age group in the London Triathlon. "TI is about balance, core stability, streamline and propulsion, swimming like a fish - it has nothing to do with trying to pull yourself through the water"
Select this link: Kelley Adams and Total Immersion United Kingdom