Encourage your teens to be independent in different spheres of their lives, while keeping an eye.
Establish boundaries and remain strict, unless they have got pre-approval from you for a particular occasion.
Be realistic about expectations and give your teens the mental space to live up to them.
Since teens are used to being admonished, lecturing them is useless. Instead, pick up on inherent cues by listening better.
Teenagers have it tougher than other kids. Maintain compassion when listening to their struggles and see power struggles vanish.