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You need to root your device. Head over XDA for further info.
Yes,true. It might void warranty.
I think @Thommo may assist you better. I say soft brick your device is the worst that could happen.
Lets say your Graphics chip stops working or headphone socket etc then normally this would repaired under warranty however if you were to unlock your bootloader then any repairs could be refused as a result of this - Softbrick isn't an issue as this can repaired via Sony EMMA or Flashtool along with a .ftf firmware file
Your asking the wrong person because as soon as I buy a phone the 1st thing I do is Root it so I can uninstall the apps I'll never use and other things