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So don't worry so much about how to use  had had  as a unit of grammar, they will come together naturally when you want to express the verb ' to have ' in the past perfect. Let's consider a different verb for a moment like  to want .
Usage Notes. As a conjunction, one sense of as is âbecauseâ: As she was bored, Sue left the room. As also has an equally common use in the sense âwhile, whenâ: As the parade passed by, the crowd cheered and applauded. These two senses sometimes result in ambiguity: As the gates were closed, he walked away.