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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 .
When you use two adjectives together, you sometimes use and between them and you sometimes don't. When you use two adjectives together (also called paired adjectives), you sometimes use a comma between them and sometimes don't use a comma.hen you use two adjectives together, you sometimes use and between them and you sometimes don't. When you use two adjectives together (also called paired adjectives), you sometimes use a comma between them and sometimes don't use a comma.