Thanks! I take it root is required for the steps you listed? I've thought about rooting, but don't know that I want to do it unless I can get better battery life along with the latest radios.
I was rooted, but I don't think that you need to be. Your phone's bootloader *is* required to be locked/relocked, though. And you will need to be familiar with things like adb/fastboot/etc.
Now, at the end of the whole process to the process of updating to the OTA ROM, your phone will be rooted since that's the way that ROM was shared. But you can stop after step 4 in my little summary and have only the latest HBOOT and radios. If you go that route, then obviously you won't have to download or transfer the ROM.
Good luck!
john