Slide the opening pick down the battery-side of the phone, separating the adhesive.
Stop when you get to the bottom of the battery to avoid damaging delicate capacitive buttons at the bottom of the display.
Go slowly so that the tip doesn't slip out of the seam. If sliding becomes difficult, reheat and reapply the iOpener.
Leave the pick in place and grab a second pick as you proceed to the next step. Leaving the pick inserted can help prevent the glue you just separated from re-adhering.