Envisioning yourself accomplishing your objective is just a beginning. To be thorough, visualize your life as a whole, including all the changes that would result from achieving your objective. By doing this, you make your vision real enough to have significant effects.
For example, imagining a big pile of cash on your dining room table isn’t enough to achieve greater wealth. If you really did have that much money, would you really have it piled up on your dining room table? Unlikely. You'd most likely have a bank statement or brokerage statement that showed your huge balance.
Also, consider everything else that would change in your life. Would you still be going to work every day? Would you be working in the same place? Would you be living in the same house? Drive the same car? Hang out with the same people?