Thanks a lot for this repair guide. My mom’s iPad is “brand new” again. I had no issue during the repair. Instead of iOpener I used hair dryer and a lot of patience. It worked fine to remove the glass. I also used the hair dryer when removing battery. The heat from back side of iPad case helped to soften the glue. The plastic card instead of metal spudger was my tool of choice to reduce the risk of battery puncture and case scratch.
I applied heat using hair dryer to the back side of the iPad case and then used the iFixit plastic cards(Plastic Cards) to remove the battery. It worked perfectly without any fear to puncture the battery.