I shattered the glass on my iPad during this step.

To melt the adhesive, you have to heat the glass A LOT, to at least 80°C. I was using a portable infrared thermometer while doing this. Heating the iOpener in my microwave for 60 seconds only raised its temperature to about 90°C, and leaving it on the glass for a few minutes didn’t raise the temperature of the glass to more than about 40°C. I switched to a hair dryer and heated the glass to about 70°C, which was barely enough to be able to insert one pick. As soon as I tried to slide it across, the glass broke.

I recommend having a reliable way to measure the temperature, and finding something that can heat more effectively than the iOpener. Also take caution to heat all along the top, not just the point where you’re inserting the pick. In theory the iOpener is designed for this, but it doesn’t get hot enough.

I wish the iOpener came with a specific heat rating. It has many warnings against overheating it but it’s not clear exactly how much is too much.