Good luck, did my driver mirror first, came off with no breakage. Now my confidence was up, did the exact same thing to my passenger side and pop/crack goes the mirror, cracks all the way across. Josh at Avondale got me a replacement glass. I had a small pressure pad with a hand-pump used to pry open a car window to try and use a tool to release the lock. I used that to apply a more equal pressure to the back of the mirror. Applied pressure slowly and gently pried with my fingers. Worked once but not twice. I think no matter how you do it, it is a gamble. Some have had complete success but the majority have broken at least one glass and it appears to usually be the passenger side.