The key to it though Berenice is that it is not a 'stand alone' theory - when you place it in context with other techniques and 'laws' it makes sense more naturally.
Have a read of the Celestine Prophecy and you will begin to understand the relationships between occurances and coincidence, how all the opportunities that come across your path are a chance for you to either further your goals or not - but you still need to recognise them for what they are and choose to follow the path.

Things don't just 'happen' - you need to make them happen, but the manifestation will be directly linked to your perception, conception and energies.

Have a read of it though - because you are not understanding the premise or more accurately, the methodology, behind it. YOU are responsible, not the universe - THAT is the point. A seek and you shall find mentality.