Im assuming you loosened the belt tensioner correctly to remove the old belt in the first place right? You didn't just cut the belt ?!?!
You need to route the new belt correctly maybe using this tool:
http://buy1.snapon.com/catalog/item...&group_ID=1557&store=snapon-store&dir=catalog
and then wrap it around the tensioner last, after you loosen it with a 14mm wrench of some kind.
On the v6, you pull up on the tensioner, like counterclock wise. But wait, how did you get the old belt off?
OP, I prefer the 14mm wrench b/c I find it impossible to get a normal or even a slim ratchet to fit into that little space for the V6. Also, I don't know if you finished the job, but it really helps to loosen the bolt that holds the power steering fluid and then wiggle that out of the way so you can get more leverage.