The 3M pads with the A129 do seem to be much more tricky to peel the red cover off then the ones for the A119 series cameras. Just takes patience I think. Tweezers with a good tip works well too.
To clarify, it was just getting a corner to start to peel was my problem. I couldn't get the corner of the cover to separate without the corner of the adhesive pulling off as well. Luckily after doing the knife trick in that video, it peeled easily.
That is funny, I had the same problem and I ended up cutting my finger from the frustration. Taking the backing off the adhesive was the single hardest part of my installation. lol