[Q] rooting 4.3 w/ locked bootloader topic

so iflashed .534 firmware ang root using vroot then i update .290 via OTA, now the root is gone. my bootloader is locked.
im kinda nervous rooting 4.3 cause im reading lots of people hard bricking their phone on 4.3. is it really safe to root 4.3? i will be followibg this tutorial:
forum.xda-developers.com/showthread.php?t=2572988