They can be a tight fit to get your hands in there to run the belt over all of the pulleys, but a little patience will work wonders!
As Scott says, there is usually a pictogram under the hood that shows the belt routing. I've found it easiest to run the belt around the largest pulley last...it's easier than trying to flip it over one with a small diameter.
There should be an automatic belt tensioner, too. You'll need a wrench/breaker bar to take the tension off of the belt to remove it.
hth
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Joel Adams
C3VR Lifetime Member #56
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"