I haven't installed a Core 2 Duo, but the K6-2 chip was not a hard chip to install. Flip the locking lever up, make sure that the missing pin is properly aligned, place the thing in, and lock.
I know the K62 wasn't difficult, but the Core 2 Duo installation is friggin' effortless; just drop it in there. It doesn't even have pins to align, just make sure the corner arrow points the right way.
Those giant coolers aren't that difficult to install either, they just take time: as in removing the mobo and screwing the backplate. I actually had to cut my backplate up so it would properly mount on the back of my mobo. Wasn't difficult but it took time.