To be truly free, one must first understand freedom to be innate to sentient beings. If you are able to act on your own will, you are free to act how you wish, no laws can truly control you.
Next, one must realize that even the most fundamental beliefs can be wrong, and they must be able to doubt themseves.
Simultaneously, they must be able to realize when change is occuring to themselves, and to realize what their true "ideal" state of being is.
I'm not entirely sure how to put it, but the best way i can is as such:
I must be able to realize when i'm being influenced or altered, and resist it. Not resist as in never learn or accept change, but make sure to always contemplate why you believe what you do, and not to immediately accept in everything you now believe just because you believe it now.