I got hung up on this step for over an hour. The key for me was to keep the watch straps on! I initially took them off thinking it would be easier to work with the watch, but I guess just the little pressure I placed on the glass while trying to hold the watch and use the blade was enough to keep it in place. At first I thought I didn’t use enough heat and ended up reheating the iOpener a few times and applying it to the watch over the course of an hour. I put the top strap on, put it back flat on the table and held the watch secure with just the strap. I gave it another go with the blade and the screen instantly popped off. Also, be careful with the force you use on the blade… it seems with adequate heat, you don’t need to use that much (I ended up cutting through the Force Touch sensor and punctured the battery).