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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 .
WordReference Random House Learner's Dictionary of American English Â© 2017. inâ¢terâ¢twine /ËÉªntÉËtwaÉªn/USA pronunciation v., -twined, -twinâ¢ing. to twine together: [~ + object]They intertwined their arms and walked off together.[no object]Their arms intertwined as they walked off together.