Why is it so important to visualize your manifestations ahead of time, with full sensory simulation? Because your subconscious mind will have a more complete set of pre programmed information to serve as instructions.
The subconscious mind stores all your sensory information from all your five senses from the day you were born to today in it's memory banks.
It will work 24 hours a day, 7 days a week, scanning it's ever increasing memory banks and your outer environment for opportunities, leads, and ideas for attracting and manifesting your sensory stimulated visualizations.
Your subconscious has the ability to create a workable plan for you, or assist you with your current plans, but it is critical for you to preprogram in a complete sensory filled experience as emotionally and specifically as you can.
When you firmly imagine or visualize a goal with all your senses, in due time, your subconscious mind "senses" anything associated with your desires attainment, making you consciously aware of them.
Repeating your visualizations as you would affirmations, communicates to your subconscious that it's still important to you and that it should continue to search for ways to attain your goal.
A full blown sensory imagination is the best communication drawing you the the things you imagine.
  It is hard to visualize and hold fast in your mind a billion dollars.
But it is extremely easy to visualize the lifestyle and business of a billionaire.
Imagine the kind of car that you would drive, the house that you would live in and the things that you could do with having lots of money.
The more images of a wealthy lifestyle you have, the more intentions you are sending out for attracting wealth.
It is like having ten intentions sent out to manifest compared to having only one.
Be abundant with your thought power.