The Low Hanging Fruit
You want to know where to get started. Achieving 'complete privacy' is intimidating, but you don't want to despair.
Here I'll suggest some low hanging fruit, practical privacy actions that bring a high bang for your buck. Those seeking ultimate privacy might disagree with some of my choices.
But they might be right for you because either your goal destination is different, or the energy you're willing to expend is less....i.e., you want to achieve privacy practically.