If you have any decent amount of anxiety, I recommend looking through the book while in an, at least moderately, anxious state. Take some notes of what conditions you think you've got. Make sure you really consider all the possibilities. Next, analyze every person you've known since 5th grade. Don't hold back.
This mindset is the miracle. This is a memory map. Would you forget that Leukemia's cancer? No. Would you forget
Don't hold back.
This will lead to you understanding more useful questions. For example: Now that you've diagnosed everyone with their appropriate malady, what is the appropriate course of action for for which person (you've diagnose) in your life?
Should you employ...
a) primary intervention
b) secondary intervention
c) both b and c
d) none of the above
For whom would b) be especially contraindicated?
Just do this. Apply it to your life. Enrich your understanding of those around you. You will learn so much... it's hard to forget some things.
This is the power of memory maps.