it is reasonably straightforward - normally you remove the power clip from the fan and unclip the heat sink/fan from the top of the cpu. Often this comes off cleanly and you can peel the old paste from the fan and cpu make sure you are earthed to remove all static. I normally leave my mains lead in with the socket switched off giving an earth to the case. You then unclip the lever from the side and lift it up. stick a bit of tape on the side next to the lever so that you keep it the correct way round. Lift off the cpu. place it the same way round on the new mobo with the lever up and it should gently drop onto the socket. Lower the lever and lock it in place. Evenly coat the top of the cpu with about 2 mm of paste. then put the heat sink/fan onto the cpu and attach the clips. connect the fan cable to the power supply.