Very easy job. Easier and faster than the starter job. If you did the starter the serpentine is a breeze. Well the routing might make you a little cross-eyed. But if the belt isn't squealing you shouldn't worry about it.
I left a plastic flashlight in the engine compartment one time and forgot about it cranked the car up and the belt belt cut/melted right through the flashlight before I realized the grinding noise and hard start.
Frayed the outside of the belt.
I drove it another 6 months before it started to squeal and then I changed it
