BP attach those pin havign things to the Mobo first. then do the paste on the CPU, remove the sticker from the bottom and put the cooler in place, slowly twisting it a bit clockwise and anti-clockwise to spread the paste. then just line up the holes and twist the pins with a screw driver and you are done! do all this with the cooler lying down. no need of accessing the back when you are putting the cooler on!