63' Dodge Dart Headlight Switch Repair

The "trick" is there is a button ( it's not shown in your pic) that you need to press, this allows you to pull the knob all the way out of the dash.
Then there is a threaded nut that holds the switch to the dash. It should be round with about six notches in it - yep there's a special tool for it but I've gotten creative and removed them with a small punch (aka screwdriver) and a air of needle nose pliers.
The switch can then be pulled away from dash and the wiring connector carefully removed from switch.
Hope this helps.