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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 .
The has/have been form is known as the present perfect and relates what has happened in the past to what is happening now. The had been form is known as the past perfect and pushes the events further back. It relates what happened at some time in the past to the situation at some other time in the past. If I say I have been at work for eight hours, I describe the position now. If I say I had been at work for eight hours, I describe the position as it was at some earlier time. share|improve this answer.