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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 .
To have as a main verb. As a main verb â to have â implies the meaning of possession. For example: âI have a job.â âI have a car.â I don't have any time.. When it is used to indicate possession you can say I have... or you might see/ hear I have got.... When you are talking about actions, you only use have. For example: Possession:-.