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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 .
In English, the perfect tense consists of two words: the verb have, sometimes called an auxiliary verb, plus a past participle (a form ending in-ed or-en, e.g. walked, arrived, taken, eaten).The perfect tense is formed in a very similar in Spanish: a form of the verb haber (to have...) is used, followed by the past participle of the Spanish verb. In Spanish, most past participles end in-ado or-ido (although there are a few notable exceptions).hat is, it generally expresses a past action that has relevance to the present moment. Note that unlike some other languages such as French and Italian, the Spanish perfect tense isn't used as 'narrative' past tense. In other words, it isn't generally used like simple past English forms such as ate, went, arrived etc.