How challenging?
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The Sacrificial Stones are on an island (within a lake) not much bigger than the circle. Getting ashore is your first challenge.
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Eikthyr (LOL two within viewing distance to each other) is your only "gimmie". And before you think that a gift, consider how you're going to get his trophy back to his Sacrificial Stone.
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Bonemass and the Queen are ridiculously far away. But as you grouse about sailing to her, you'll also note how close she is to the Ashlands.
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Hildir and Bog Witch are not too difficult to find, but wow, Haldor sure is.