For the GSM variant, just download the ROM, do a full wipe, and flash the ROM via Clockwork Mod Recovery. A root fix and updated radio can also be flashed via CWM. If you have the Verizon version, do a full wipe, flash the ROM, and flash SuperSU. Seriously, it's just that easy.
Oh, and the best part? Since these are official Google builds running on the latest Nexus phone, they are apparently largely bug free. Even the Verizon variant seems to have everything in working order.