It took me one time and only one time of doing this to realize that I just can't baste on carpet. Now (when I don't have time to go some place that has large tables) I just move my table out of the way, sweep and mop, and then tape my backing to the floor in my dining room.
I much rather going to a place that has a dining hall or even the library where they have conferance tables and putting two together and basting on them. Much easier and easier on the body!