Is the headlinner out? If not unclip the front. Then maybe carefully using a screw driver pry the sunroof back. Or any other large object that can be used to get it moving. You need to move the sunroof back in order to get the clips that hold the headliner in out, pull forward the headliner should free up. Then you need to move it back forward in order to undo the 4 bolts that hold the metal panal itself in. Look up when the headliner is out you will see a black metal bracket and two gold bolts on either side holding the panal in. With the panal out of the car then you can procede with fixing it.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200