ET has a very useful summary on how to interact with Big Brother. Below is just a sample.
Make one or two everyday tasks completely private, just for practice.
Buy and use a prepaid cell phone or credit card with cash.
Turn on a netflix movie at home, then drive somewhere without your cell phone, and add the spent gas back to your car (with cash) before you get home.
Create an email account that you only access from a Starbucks on the other side of town. (Left your cell at home, and refilled your gas tank before you got back, right?)
Pull the battery out of your cell phone and have a private conversation, or put it in the bathroom with the exhaust fan running loudly, and flush before you pick it back up.
Work out codes with your friend, and text eachother with unassuming messages that are actually code for other messages.
Keep track of all the “traffic” cameras at the intersections near you, practice plotting routes that pass few or no cameras (You probably shouldn’t do this on Google Maps…)
Don’t ever think BB is all knowing.