As you slice through the adhesive, note the following:

The top has a large patch of thick adhesive. You'll need to slice 1/2" deep in order to cut the adhesive.

Don't slice deeper than 2 mm along the long edges of the iPad, or you risk damaging the display panel.

The lower edge also has thick patches of adhesive, but there are delicate flex cables in each corner. Don't slice deeper than 1/4" around the lower corners.