Not simple. You might need a manual. Do a search for special snap on wobble on long extension. It's an Fx-13 or something like that.

You definitely have to remove the fan. Also be prepared for the belt tensioner to be bad. When you put it back together it won't tighten properly. Happened to me twice.

Be sure to buy either a factory rebuilt or, what is the brand, LASO.

Others will have more advice on this nasty task.

Steve