I'm starting this same project on Friday. Removal of furnishings is the first step. You also have to investigate how the carpet fits around the slides. On mine, the main floor carpet goes slightly under the lip of the slide but I think I can get at it. On others, the only choice may be to cut along the front edge of the slide and tack it down there. Mine also has a flap on the front edge of the slide that needs to be bound once the piece is cut to fit. I've got a carpet shop lined up to do that.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL