light pressure on the outside edge of the mirror should be enough to pop the mirror glass and backing off the motor.
I've done it 2 or 3 times without breaking the glass, haven't broken any glass... good luck.
1996 Firebird 3800 Series II, T5 swap RIP 3-31-11
It lives on: Engine and trans from ^ are now in v
1996 Firebird 3800 Series II, T5