Manifestation is what a lot of celebrities and successful people say they did before they reached their goals. When you look up the definition of manifestation it tells you it is the 'the act, process, or an instance of manifesting' . Notice the words of movement 'action' and 'process'.
When I see that, it doesn't tell me to sit with it and focus on it and concentrate on it, although your thoughts do bring into your life what you think about; negative or positive. What it tells me is to, think about what my goal is, process the impact it would have on my life, create a plan and act on it. Action is what I'm all about.
Theories are nice, praying and meditating opens up your life for the blessings and open doors available but doing actions everyday towards that goal is when the manifestation happens.
So when you wake up in the morning, look at your vision board and recite your affirmations remember when you're done to move in the direction of your dreams with focus and intention backed by a plan.