Will You explain This Sentence?

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Nov 6, 2012 11:43
The following is extracts from a news paper, which reported the interview with IMF's Christine Lagarde.

"If you feel confident you are going to move on, and you're also going to give confident to other people. And it's the addition of this confidence shared with others that is actually producing the energy that takes you forward."

I understand the meaning of the second sentence roughly, but I don't know the structure.
I am wondering what the uses of the first "that" is and what "it" points at.

I'd appreciate it very much if you would explain about it.