yeah my prev. post is confusing. just reread it. lol.
No, there are no screws for removing the lift glass. No screws at all. THe only screws are for the third brake light you have now. The tahoe brake light. You have to take it off.
For the glass, close the hatch, which it looks like you have the hatch open in that pic, close it and open only the glass part. Look kind of right where you put the arrows on that pic, where those srews are and you will see little C- clips taht are holding it on, Left and right side, only 1 of these per side. Take them off, then sllide the glass over to the left, Might have to take off the vent caps. (i did) make sure you undo your defroster plugs also. Slide off, do the same for putting on in reverse. Sllide it back on, put the c clips back and your done.
If you want i'll try to get a pic if you need.