the covers at the side of the car at floor level just pop off, so depending on what your wanting to do you can get reasonable access by just removing them.
when I had a damp floor from my window regulator panel not being sealed last winter I just put half a newspaper down with a few little weights on top of it, then the next morning replaced the paper, then at night replaced the paper again, after about 2 days was fine (obviously I did this after fixing the problem that was causing the wet carpet though...)
