Any instructions available to root on JB? Same as ICS?
The instructions are the same you just need to use an updated SuperSU or whatever to obtain root vs ICS.
Going to be super generic here as whatever guide you are following should be more indepth:
1. fastboot unlock bootloader
2. Use fastboot to install a custom recovery onto the device
3. Use the custom recovery to either flash a ROM or flash the proper root files. For JB these files, need to be updated from what was used with ICS. SuperSU Download <-- you can grab the updated version there if your guide hasn't updated itself.