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 instead of the usual Range and Target restrictions (p. 19) even if the land would normally be untargetable. 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.