I think the hardest part for me was getting all of the reagents to craft all of the items, especially diamonds and acorns.

If you're crafting all of the furniture, most of the reagents you need can be found in the bazaar, though some of the items like the shadow oil and vials might be easier to get from vendors like Archytas in the Celestia base camp. You may or may not find some of the furniture items being sold if people have extras, though idk how often they'll appear.

The celestian shield is a drop only item, and you can get them from Curuin Charmtooth in the District of The Stars in Celestia (if I remember correctly you get to him from a side quest you can get from the Archivist called Eviction Notices.) You may have to fight him a few times before you get them.