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Just make notes that you can find for later on how to reverse the changes you made.
A little practice now would not hurt, also a bit of googling the manual on the commands.
Sorry to be an alarmist - It will not "brick" from those changes, It will refuse to update with an update error code (see those indexed codes in our index system).
Now that you have the adminstrative password to your Kindle, you get all of the duties and responsibilities of being your own computer system administrator.
Sort of like learning to swim by jumping into the deep end of the pool.
Enjoy.
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