How exactly does one Root the phone

I realize that today is release day, but everything I've been seeing suggests that rooting is a simple process and the difficulty comes in when you try to unlock the boot loader. It has been some time since I've been on an HTC, and I know this question is probably, but how exactly do we root so TWRP can be installed?

Thanks in advance, especially if I've missed the thread that tells us how to do it.

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