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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 .
Forms of Was and Were. As I said above, was and were are in the past tense, but they are used differently. Was is used in the first person singular (I) and the third person singular (he, she, it). Were is used in the second person singular and plural (you, your, yours) and first and third person plural (we, they). 1  I was driving to the park.  You were drinking some water.