I doubt you've gone too far. I haven't done any screen replacements on these myself, but this looks similar to any other tablet I have done screen replacement on. [br]
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The tricky thing with Kindle Fires is that there are so many variations. You mentioned Kindle 8, but there are 8" variants and 8th generation variants, both of which could be referred to that way. It will help to know the specific model of Kindle you're working on. If you can still use the screen, it will be in settings. Otherwise see if there are any identifying numbers on the housing.