Default FireWater S-Off

Hello Everybody,
Please help me out...I am a bit confused, I have HTC Desire C... I just saw the FireWater S-Off Tool which can S-Off most of the Qualcomm based HTC Phones...
I am rooted and have all the instructions ready, just need to use this tool...
But, I am afraid that it may not hard-brick my phone...
Please help, I would really appreciate it !
My device is HTC DESIRE C S-ON at this moment and has a qualcomm snapdragon s1 processor...