Crap, well i joined the club here.
When i bought my trailblazer i found out that the mirror of the passenger visor was removed by a previous owner. I got a replacement and removed the old one succesfully as described here.
The problem was getting the new one back in!!!! What a real PITA indeed!!!
Finally i was succesfull replacing it but only after some other tips i found. Here it is for others daring the same thing!
1) You first need to remove the windshield trim piece that goes from the dash to the headliner.
2) Next remove front assist handle from headliner. This is kind of tricky. Have a screwdriver handy and pop plastic covers up.n They are attached on the sides. Take handle and push towards the rear of the vehicle and stick screwdriver in hole and pry hold tab up. The front comes out similar.(Remove back of handle first)
3) Next recline seat and pop center trim back from it's clips.
4) Open and rotate sunshaded parallel to side window.
5) Insert a small tool into hole @ arm of the visor.
6) Push upwards on tool while rotating towards windshied. The pivot arm will appear to be recessed into the bezel now.
7) Push outward and pull down firmly. The sunshade and headliner should be seperated from the roof structure.
8) Now pull down the headliner and rock the visor up and down and the black clip should pop off above the headliner.
9) If you have lighted visors pull the wires away from the headliner and unplug.
1) Plug in visor.
2) Position wire into slot on visor.
3) Position visor into hole and place retainer clip between headliner and roof structure.(You will need an extra hand with this step) (Oh Yeh, The retainer clip is a real patience tester. There are (3) slots that it fits into on arm. Not to be confused with the wire hold down tab.)
4) Make sure visor is parallel with windshield and push up into hole. Continue upward pressure while turning visor towards side window. As you turned it the bezel should have become flush now.
5) Return all trim pieces to their spots.
Now my oldest daughter can put make-up on with mirror and light!
Thanks to all that helped in this post!