How do you change the serpintine belt on a 2002 toyota camary?

Answer 1

you need a tensioner tool.
http://cgi.ebay.com/NEW-SNAP-ON-TOOLS-BP-8-PC-SERPENTINE-BELT-WRENCH-SET_W0QQitemZ160084709463QQihZ006QQcategoryZ42264QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

and draw a diagram of how the belt goes around the pulleys before removing the old one.

Answer 2

With a 1/2" ratchet, rotate the tensioner arm (there is a square hole on it), once the belt is loose, remove it and install the new one.
PS Some vehicles may have a square recess for a wrench instead of a hole but the idea is the same.