I've played with the ruffler, gather foot, the button holer and had success.
The wide hemmer is something I need to practice with. And I'm not finding many youtube videos on it. The ones I am finding are of people who aren't sure they're using it right and having trouble. Or done in a way that I'm having trouble understanding it.
Guess I'll just have to fuss with it. Good thing that I have some scraps to play with.