I have noticed a ticking noise after i shut off my car while the fan slows down to a stop. I noticed that it feel that a bearing is worn out in the radiator fan.

NEW GENUINE OEM RADIATOR COOLING FAN FOR AUDI A6 & A4 | eBay

Thats a link to just the fan I need. I wasnt sure if anyone had replaced this part before and how difficult it really is. I know some of the mounting bracket might be a little difficult to reach but other then that how difficult has it been in your experience? Also, is it more difficult to just replace the one fan then buying both at the same time and replacing the whole unit?