A porch swing hanging from ceiling eye hooks has real weight suspended over your head, so the job starts with supporting the seat, not unbolting the hooks. Do that first and the rest is a straightforward two-person carry.
Pro tip: Mark which link of the chain sat in the ceiling hook with a zip tie so you can rehang the swing at the exact same height without re-leveling it from scratch.
Watch out: A porch swing that is still hanging when you remove the last eye hook can drop several feet onto whoever is standing underneath; always support the seat first.