I saw a post of a photo on , maybe an AVEO forum . The guy took 2 zip ties / wire ties and tied the 2 cam pulleys together . Tightly so they could not move . Before he removed the belt . Cut & remove the ties , when the install is finished . Before you start to reinstall all the covers .
Another tip I have read , then you mark each cam pulley t the top with white paint / marker and the old belt . Then mark the flywheel pulley and the belt .
With everything marked , remove the old belt & transfer the marks to the new belt . Replace all the parts and pieces , align all the marks together .
My 2015 Sonic 1.8l has the water pump driven from the serpentine belt . It is not under the front cover & not driven by the timing belt . So , it can be serviced independent of the timing system .
God bless
Wyr