All manifestation techniques come from the idea/belief that we are the creators of our experience, and that is by using the mind, because reality is mental.
Therefore practically all techniques will use a 'simple' formula to change how you look at reality, and this is done by reprogramming your subconscious mind.
You reprogram your subby by:
Identifying and debunking your false beliefs
Using various techniques to replace them with the right beliefs about the world that will help you achieve what you want
like affirmations and decrees,
and then taking some sort of affirmative action to cement the relationship between action with intention;
rinse and repeat.