I've not delidded that chip, but I've delidded several haswells(celerons). I used a razor blade. I attacked the corners, until I was able to feel the blade get through the glue that holds the IHS on. once you get through one side, the other's come pretty easy. When the blade gets through, be careful, there's some connections on one side of the chip, right by the die. And you don't want to hit those, or the die. What you use for a new TIM is up to you, but if you choose LMU(liquid metal), be very careful. I tried it, created a nice little paper template, that fit the die pretty tight. I still managed to get some LMU on those connectors and fried the chip. If I were ever to try it again, I would do a bit more research on the...