There's a fair amount of work involved, and it's far more than I usually bother with. To be honest, I never install a hack unless and until it takes a minimum of effort. There are simply too many gadgets in the world and life is too short to spend too much time hacking any single device.
And now it's easy enough for me to do it. It's down to just a few steps. Following the instructions here, you need to download the Zip file and the APK install file.
Unfortunately for me, I've already returned my Nook Tablet. So instead I have to post the following video:
While this is a great first step, it still won't get around the fact that the is locked down by a signed bootloader. It's still going to take a fair amount more work before we can see a hacked firmware. Also, I fully expect B&N to break this hack with the next firmware update for the Nook Tablet. remember, it's their tablet, not yours.