Just an FYI that hip pain is sometimes a symptom of other issues. I experienced horrible hip pain two years ago that landed me in PT. It was largely caused by weak glutes. I would have never figured that out without the help of a sports medicine doctor. While I'm all for stretching, the word "pain" suggests to me that something more serious is going on than mere stiffness. Especially if it's been sore for a while, consider seeing a doctor. I put off seeing one myself for far too long and regretted that I'd hadn't been more aggressive. Even if it's nothing overly serious, it couldn't hurt to get a professional opinion as to what will best remedy your discomfort.