This first part is the Northern Direction if you are starting with easily measured results. Become aware of what you can see, hear, smell, taste, and even feel. Potentially practice removing some sense from use, by an exercise of looking at a burning candle in the dark, then blowing it out, knowing as becoming aware of senses other than the visual.
Hearing protection, such as taking a break from flavor of some kind such as sweetness. This can be a fast from refined sweetener, because candy can lose its sweetness. Switch to another flavor, such as salted oatmeal with the possibility of not adding certain things to a drink such as coffee, so the additions will again stand out.
Afterward you will be ready to evaluate details of how your perceptions have changed, with some people journaling about this. And other people just, logging their progress, in the form of internet entries. This will be a more literally existing evaluation of the great many hidden details, so fire with its truth and structure will during the appropriate time reveal both structure and truth.
Once this structure and truth is revealed, the knowing of the air-element will happen. And you will find in shock, how certain people share your perspectives. This is experience based knowing of intuition, with it differing from, logic based knowing of a right hand path of a strong and orthodox student, but one resulting from passion and willpower.
Then when things are revealed, it will be a storm of action, followed by demons disappearing, because need to have time to adjust to these explosive changes. This spiritual progress requires a certain amount of physical realm of planning, just like physical progress will create potential for great amounts of spiritual involvement.