Confident people. What's their secret?

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Across
  1. 3. Forget or disregard something, typically a feeling or a past difference of opinion.(2)
  2. 5. To a great extent; very much.(2)
  3. 7. Absolutely necessary; essential.(1)
  4. 10. Friendly and socially confident.(1)
  5. 11. Become responsible for a task in succession to another.(2)
  6. 12. Make determined efforts to deal with (a problem or difficult task).(1)
  7. 13. Clear and definite; real.(1)
Down
  1. 1. (of a person) deal effectively with something difficult.(1)
  2. 2. (of a series of events or facts) begin to make sense.(3)
  3. 4. Confidence in one's own worth or abilities; self-respect.(1)
  4. 6. Give one's services or resources to make it easier for someone to do something.(2)
  5. 8. Face up to and deal with (a problem or difficulty).(1)
  6. 9. Write (something) quickly.(1)