1999 Saturn SL1
To remove your belt use a 14mm or 9/16′s wrench to rotate the tensioner pulley and create slack in the belt and remove it from the tensioner pulley.
Check your all of your pulleys and make sure there free and clear of any debris or fluids.
To install the belt, route the belt according to the diagram posted above leaving the tensioner pulley for last. Make sure the belt is around all the pulleys correctly and rotate the tensioner one more time and slip the belt over it.
Inspect your pulleys again before starting your vehicle.