I just got done removing mine, from what I found, wiggling the screwdriver back and forth with some force while pulling up on the mirror worked the best. Didn't have any issues at all. Just took a surprising amount of force.

need to do this with my car as well. I got a auto-dim mirror off a 2005 Taurus. hopefully the OEM harness is tucked up in there

Oh, its there, believe you me.
You really have to look for it, but its thee.
Need the plug pin out and color?

I have the wiring chart already...I had bought one of those spiffy 2009-2010 Ford Repair DVD Manuals before you guys here on MF linked me to that online version.

thanks for the confirmation the wiring harness is there. I hate wiring stuff