i just changed mine this summer,,,its a pretty simple job,,,on the rear one i did have one bolt that rusted into the metal insert of the disk,,,had to take it driveshaft and all out and put it up on the bench,,,some penatrating oil and a few licks with a rivet hammer changed its attitude!!!,,,lucky i bought new bolts with the new lock nuts!!!,,,

my disk weren't that bad, i changed them because my carrier bearing was trashed,,,i had it all apart so i changed all,,,you may want to look for play in the carrier bearing as well,,,once you get the exhaust system off its all pretty simple,,,

good luck,,,