Provide an overview of what you're about to do before you do it.
Everything you say is brand new to them, so speak slower than you think you should.
Talk about the code as you write it, and explain your thought process.
When you make a mistake, address it openly and talk through how to fix it.
Be willing to say "I don't know!", and show them how you find the answer.
After you ask a question, wait until the silence is uncomfortable, and then wait some more before you jump in.
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