UNrooted.
No computer, no ClockworkMod, no nothing. All I did was download the 4.1.1, move it to my external SD card, Turn the phone off, turn it back on in recovery mode, wipe the cache, install zip from extSDcard, reboot and I was done. 15 minutes. It doesn't register as a 'flash' on the counter.
I found out after I had installed that app, that the way to activate Google Now was with a long press on the menu button. They are pretty slow on replying over on xda...so I took matters into my own hands.
To be perfectly honest, the new notifications are the best thing about JellyBean, imo. Google Now, while interesting....I'm going to say it's a little overrated. As far as fluidity "Project Butter"etc...I really don't notice much difference.