When instructed to "Repeat this Power", do you have to obey the range/target land restrictions?

When instructed to "Repeat this Power", do you have to obey the range/target land restrictions?

Only if it doesn't tell you where to Repeat it. If a Repeat specifies where to use it, you obey those instructions, ignoring the original Range and Target restrictions (p. 19). In the rare case that the origin land matters when instructed to Repeat a Power in a specific land, it's the same origin land as the original power use.
For example, "The Land Thrashes in Furious Pain" could be Repeated on an adjacent land without Blight.