There are 2 tiny locking pins at the back you may need to spudge the connector casing a bit on each side to release these , I did.
I did the shattered screen version of this repair . As others have said don’t bother with suction cups and the picks as the screen does not have enough intergrity to lift and will just bow rather than pull up from the edge . I used the angled tweezers and worked my way around the edge picking off shattered glass . If you push way from the screen towards the edge you don’t risk slipping and scratching the lcd .
Once I had the screen off obsessively scraping off all the adhesive and cleaning with isopropyl is key to a neat rebuild along with the usual edge straightening if bent in a drop.