[Q] Need basic help with HTC one Max topic

I Recently got a sprint variant HTC One Max, and it keeps rebooting over and over. After a little bit of researched, I found there was a problem with rebooting with the 4.4 Kit Kat version of sense, and that loading a ROM onto the phone would fix it. So I have been trying to research and read diligently, finding out as much information as I can about the process, but my biggest fear is that the phone would be bricked. Can someone tell me the chances of the phone being completely bricked, and all the steps I can do to avoid this? I don't really have any data on the phone that is important, I just don't want it to become useless as this is the only that I can use for a while.

I have been looking into the Cyanogenmod 12.1 Rom, so if anyone has any advice for me, I would gladly take it. Again, this is my first time doing anything of the sort, so the task seems daunting and challenging.