Insert an opening pick between the mid frame and the display.

Slide along the bottom to loosen the adhesive.

If the adhesive was heated properly you can separate the display from the mid frame by turning the opening pick sideways.

If you can't separate the display easily, re-heat the iOpener and repeat the procedure. You may also want to use an Halberd spudger to carefully slide around the whole display frame to loosen the adhesive a little bit more.