I don't know how the '60 and newer ones go together, but the '50's ignition switches are real easy to remove & install. You can open the door and squat down outside the car, leaning inside you can reach in behind the dash with your left hand and just push the switch in toward the dash, while using the thumb of your right hand to twist the bezel center retainer counterclockwise. It will release and you can pull the switch out from the back. The bezel itself is notched so it can only go in with "off" at 12 o'clock. The switch housing also has a notch at the top.
To re-install you need to guide it back in so that the notch lines up with the keyway in the switch hole cutout thru the illumination panel at the back of the dashboard. The ignition switch is spring loaded. While holding the bezel and center retainer in place, push the switch in with enough pressure to allow for to bezel retainer tabs to engage and just turn the center piece clockwise with your thumb. There is a special tool for this, but I have never needed it. Again this is for the pre 1960 models. What you have may be a little different.