The Sin of the Spies: How to know When to rely on divine Intervention

Questions posed in this very important 4 minute short vort by Rebetzin Tzippora Heller :http://www.naaleh.com/viewclass/189/single/

1. What made it into such a disaster?
2. Who are we to deserve divine intervention?
3. How to know when to do our hishtadlut and when to rely on miracles in Hashem?
4. What was the difference between the mission of the spies in Parshat Shlach and Sefer Yehushua
5. How their sin relates to the question of Who am I , and what am I  at this moment