Sometimes, experience isn’t everything. Julia Stiles thinks her time on “Save the Last Dance” may not translate the way fans expect when she hits the ballroom for Season 35 of “Dancing With the Stars.” The actress, who famously played aspiring ballet dancer Sara Johnson in the 2001 dance drama, will be competing against 15 other celebrities, including “Step Up” star Jenna Dewan and “Glee” alum Harry Shum Jr., this fall. Following Wednesday’s official cast reveal, Stiles, 45, dismissed the notion that her experience working on the dance film would give her a leg up in the competition. “I think it’s a bit of a disadvantage,” she told…