How does one get their foot in the door in relation to Design?

I'm not really trained enough to be a Designer as such but I'm slowly teaching myself programs and principles.

I've tried doing courses but get so bored with the constant teaching of art history and the colour wheel as I've done that all before, so in the end I don't stay with the course for very long.

I'm coming from a heavy Art background. I'd do any job as long as it was somehow related to Design and/or Art and could work my way up the ladder.