Welcome.... Not sure where the experts are at the moment, but here goes..
Perhaps the illustration will help, Yes it is tight conditions.
I would start at the crank pulley & then go over the A/C pulley, pull back the tensioner, & loop it over Alternator & gently release the belt tensioner..
IIRC a 3/8" drive rachet will fit the tensioner square hole (see pic) to pull up on it.
..........2008 HHR Panel 2LT "Southern Edition"..........