I've got a good route for these eyeballs that'll save you some time since they're pretty spread out. Start at Squall Hideout shrine and actually look backwards first thats where youll find the first Buddha head just sitting there waiting. From the shrine head right along that ridge, and you'll spot the second one (these first two are probably the easiest to grab). Now this is interesting because the third one requires you to cross over to this wooden platform where some rat enemies hang out, maybe clear them first since they can be annoying while you're collecting. Head into that cavern right by Squall Hideout and keep left going up the slope, fourth one's next to an altar which makes sense since these things are actually connected to an ancient ritual in the game's lore. The fifth eye is pretty straightforward just keep going till you hit Rockrest Flat shrine and look left youll see it on the ground. For the last one, theres this narrow tunnel near Rockrest Flat and if you follow it all the way down youll find it perched on the cliffside.

Now about Shigandang, heres something interesting - you might want to wait till you're stronger in Chapter 2 because this fight can be brutal with all those ground spikes and shockwaves. The boss actually telegraphs most attacks pretty clearly but timing is super important. Using Immobilize to freeze him works really well, and Cloud Step helps dodge those nasty body slams (you'll know them when you see them trust me). The reward is definitely worth it though since its one of the strongest items you can get (Skandha of Feeling). The whole collection should take maybe 30-40 minutes if youre focused, but dont rush it because some of these are tucked away in weird spots, and they'll stay put until you grab them anyway so no pressure if you miss any.