Actually, it's pretty darn hard to hard-brick this phone. And by that I mean being unable to recover it.
The reason is that no matter what you do you can always get into Emergency Download Mode. You do this by turning the phone off and then holding down the Volume-Down Rocker Switch while powering the phone on and keeping the Volume-Down Rocker Switch depressed until you have the screen with a big yellow triangle in the middle. The reason is that this mode is hard-embedded into the phone's core SoC (or System on a Chip) in ROM (or Read-Only Memory). You have to do some really bad things do mess with that part of the phone.
When most people think of bricking a phone, it really isn't bricked. It's more like a soft-brick as versus a hard-brick. A hard-brick would be messing up the Emergency Download Mode which as I said above, it's pretty darn close to impossible to mess that part up.
Once getting into Emergency Download Mode, you can always use a tool called ODIN to reflash the core ROM along with the partition data file (a PIT file) and get back to a working phone in under ten minutes. This is the same process that Samsung does when they have to fix phones but they use slightly different software tools to do this process.