Removing the screen involves using an opening pick and/or halberd spudger to separate the adhesive securing the screen to the frame.

As you slice through the adhesive, note the following:

The adhesive on the long edges of the iPad is about 4 mm wide. Avoid slicing deeper than that, or you risk damaging the display panel.

The adhesive on the short edges of the iPad is about 2 mm wide. Avoid slicing deeper than that.

Take especially care when slicing near the home button and charging port to avoid damaging the flex cables.

Take extra care when you slice near the front facing camera, to avoid damaging or smearing it.