sub-principle one: lucky people maintain a network of contacts with other people.

I.e.: be Extroverted, not Introverted.

sub-principle two: lucky people are more relaxed and less neurotic than unlucky people

I.e.: Be Stable, not Neurotic.

sub-principle three: lucky people have a strong drive towards novelty, and strive to introduce variety into their routines.

I.e.: Be Open to Experience, not Closed.

sub-principle two: lucky people attempt to achieve their goals and persist through difficulty.

I.e.: Be Conscientious, not Haphazard.

sub-principle one: lucky people see the silver lining in bad situations.

I.e.: Be Positive, not Depressive.

... reading through most of this, it seems like the trick is to not be Neurotic, not be Depressive, not be Introverted, and to have high Openness and Conscientiousness. By my understanding, these aren't really traits you can just "decide" to improve, and people who do not naturally possess these traits tend to experience a pretty hefty willpower toll forcing their behavior.