I never use a sawzall (that would take too long), but I don't necessarily undo all the little plastic clips individually. it's a junkyard after all. pull the grille (different years have different ways this attaches) then there are a couple 10 mm screws to undo (and early Kjs have 2 plastic tabs that needs to be pried up), then grab the top of the plastic and rip it forward and then rotate the entire assembly down. then 2 10mms for the frame caps and 6 15mm for the hooks and you're done. (be sure to grab all the frame hardware) ZJs are bit a bit more complicated because of how the hooks attach to the frame. the worst are the Commander rear hooks but even they don't take more than 5 min now that I'm familiar with how the bumper cover attaches.
if you're doing this by hand like a caveman, it'll take longer. muuuuuch longer if there is rust in play. my dewalt impact gun is like cheating! If the bolt doesn't come free, it just snaps off.
the worst part is that a couple pairs of hooks add a not-insignificant amount of weight to the long stroll back up hill out of the junkyard (junkyards in georgia aren't flat)