Great guide, thanks! Unlocking was easy for me except that I kept getting my google password rejected as invalid. Turns out I just needed to get an application password since I use 2-step verification. It might not be a bad idea to include a warning about that at the stage of instructions for running the unlocker.
I got as far as being able to get my device recognized by fastboot but I can't seem to push the recovery, i.e.
I tried Googling and reading forums and my best guess is this has to do with trying to run this from a Win 7 64 machine, but 1) I'm not sure that's the issue and 2) I don't have ready access to another type of machine so I thought my next move would be to ask for more help here
UPDATE: I rebooted the tablet back into fastboot mode again and tried again and this time it worked:
Maybe the instructions could suggest rebooting the tablet into fastboot mode again if someone encounters that error? Anyway, onto next steps, will report later...