I once talked to Tom Christian, the ham radio operator, years in my youth.

I have friends, also hams, that have travelled there for a DXPedition: https://pitcairndx.com/.

It is seriously remote.

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More detail about the island: https://pitcairndx.com/the-island/.

Transportation was by the ship Braveheart, one that often takes hams to remote places. https://pitcairndx.com/transportation/. One fun thing that they did was EME operation, a technological challenge bouncing signals off the moon https://pitcairndx.com/eme-2/

One island that has been very difficult to operate radio from is Bouvet. Landings are difficult, and one team travelled all the way there at great expense but had to turn around as rough seas made landing impossible.