have the world by the tail
To be very successful, contented, and happy in life. Samantha landed her dream job after finishing at the top of her class in college. She has the world by the tail!
has the world by the tail (with a downhill drag)
Rur. has destiny under control. The young businessman had the world by the tail with a downhill drag. He had made a million dollars before he was twenty-five. She's got the world by the tail now, but her fame won't last forever.