If you aren't familiar SafeStrap developed by HashCode is designed specifically for devices with locked bootloaders. It essentially allows you to dual boot into two separate operating systems one "unsafe system" or your main system and one "safe system" or secondary system. The safesystem will be the place that you flash and test custom Roms and mods. The benefit is that you never touch your main stock system and can run full custom roms without the risk of bricking your device.
Their is still minimal risk and upon installing safestrap you will have to agree not to blame Hashcode for any mistakes you make. That being said if you are paying attention to what you are doing and follow directions well then it will be pretty hard to brick your device.
You should also be aware that right now there is still no safety net as their have been no fastboot files for system restoral leaked to the public. So do be very cautious. I would recommend not going wild with this until we have fastboot files.
Grab The APK here: Via HashCode