Blow motor controls don't work, no hear or air whatsoever

What is your question?

When I first got the car settings '1' and '2' didn't work on the knob. I thought no problem since settings '3' and '4' did, I can tolerate this. One day setting '3' also went out and then setting '4' only worked, then I turned the knob all the way to setting '0', then setting '4' didn't work. I have basic car knowledge and have replaced a blower motor before. It just seemed like it slowly degraded. Anyone have any ideas? Does this sound like a do it yourself job? Thanks in advance.