I did mine on a table. Pretty simple and straight forward. Wouldn't be to bad doing it while still attached, as long as your sitting on a garage floor and not the driveway out in the cold snow and as long as you don't mind laying down working with your hands in the air for long periods of time.
i just did mine last night i did it out of the vehicle took two hours to pull it and have it back in bymyself but i've also done a few so i know a few tricks