there is a good thread in the how to section on it. I have changed mine two times so far. It is not easy because the space is pretty tight. Having the right tools helps a lot though. make sure you have a torque wrench, you don't want to strip anything. you do not have to remove the radiator, just drop it down.
But there is a zip tie that has to be undone on the left side of the bike so the hoses can be loosened and the radiator can then be pushed forward enough.