whine/squeak and belt question

["D.J. Bergesen" <achtungvr6@hotmail.com>]

Sorry to prove my ignorance, but I want to know when I should consider 
replacing the serpentine belt. Is it a home mechanic job, or should I get 
the dealer to do it? How much should I anticipate spending?

I'm really only asking because I've been getting a consistent mouse squeak 
for the past several months from under the hood. I'm not talking the shrill 
banshee howl like some old caddy or anything, rather when I get out of the 
car while it's idling, it sounds like there are bunches of little rodents 
squeaking around in there, not a nice smooth VR6.

Please let me know...

DJ
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