Please give an example of how to develop self-sufficiency.
Having a bugout location (an agreement with a family member, or your own little trailer or house for instance) is a good start to self-sufficiency.
In my own bugout location, I forego installing heating or cooling systems that depend on electricity, because I have been creating (a work in progress) a basement instead. Even with below-freezing temperatures outside, a basement stays at approximately 55 degrees year-round.
Wearing a few extra layers during the winter around the house is a good solution if a wood supply for a wood stove isn’t available. A basement’s cool temperature is also ideal for food storage. As far as possible, relying on natural solutions is best.