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I just went through the same thing... The button is near impossible to see once a little dirt gets on it but it is there. Should be in a corner of the switch right next to where the vacuum lines attach for the headlights...
When I pulled mine out, I lay on the floor wih my head under the dash, right arm up behind the dash and hand on the switch.
The little button should be under your right thumb and you push that in while pulling the ****. It'll take some jiggling as they never seem to come straight out.
Remember too, your headlights will be on and you'll have the shaft in your hand. Mine were, anyway...