Directors Mike Piscitelli and Mike Fleiss worked with the rocker's son, Jack Osbourne, to produce "God Bless Ozzy Osbourne" over a period of three-and-a-half years, but co-producer Jordan Tappis admits they had to start from scratch 12 months into production, because they just weren't getting anywhere.
But Tappis reveals they soon learned how to handle the veteran star, born John Osbourne, and eventually managed to convince him to openly discuss his lifelong battle with drink and drugs, and how his addictions and increasing fame affected his family.
He tells WENN, "The first year (of filming) was pretty much a waste. It was about learning and understanding Ozzy... and we wanted to find out who John Osbourne was, so we spent a lot of time figuring out how to get to him so that he would reveal the truth behind who he really was."
"A little bit of prodding (was involved). It was just understanding his personality and learning how to talk to him and how not to talk to him, and what makes him tick."
And Tappis is urging fans to check out the documentary, which premiered at New York's Tribeca Film Festival on Sunday, to see a different side of Ozzy.
He adds, "I hope that people walk away from this and say they thought they saw something that was true and honest and that's new for them, for this story."