I agree that the plastic card is the best tool to use for lifting the battery. It worked great with 2 minutes of the iOpener and a little alcohol. I used a gentle blower to dry the alcohol before reassembly. I found the entire process took about 40 minutes from start until I had books sitting on the phone to anchor the display and the charger plugged in to bring the battery up for the calibration.
I added some alcohol directly to the adhesive patches on this side of the phone and waited a couple of minutes before continuing with this step.
I found that a plastic card inserted from the left side, and worked with a sawing motion, between the screen and the adhesive worked great after the adhesive was softened by the alcohol.
A jimmy does not come with the kit. Buy one before beginning this procedure. It is the best way to lift the screen assembly without damaging the assembly.