s-off in htc speak means "security off" wich basically means access to ALL the phones partitions. you can change the bootloader,radio,splash screen,etc. prettymuch anything youd like,so once s off,it is extremely easy to install root and recovery. s-off gives you the power to brick your device if youd like,so you will need to use caution and some common sense. with s off its important to have an understanding of what youre flashing and why,and to always verify the integrity of downloaded files by comparing md5 sums(if you asked "whats an md5 sum?" google that now
other devices are unlockable via htcdevs official unlock program. you can give verizon a big high 5 and thanks for requesting to keep their high end devices out of this program
so currently the only way to root is to achieve s off.
when you have your device,you can run "rumrunner" s off tool,wich you can find a link for in this thread: S-Off coming soon!!!!!
from there we can help you install a recovery,then add root access.
in the mean time,read all you can,and holler if you have questions. the roms,recoveries,and other files that you use will for the most part need to be vzw specific,but check out the other forums as alot of the info itself will apply.
espeically check the general section since youll be coming from a completely different OS,and make sure you check out this thread for info on blinkfeed and sense 5: http://androidforums.com/htc-one/691279-sense-5-discussion-setup-blink-feed-etc.html
there is a TON of good info there