Sam takes the lead, which means he'll be walking backwards and relying on Rinoa's guidance to not stumble or run into anything. There'll be other difficulties -- like how to open doors and keep them open as they go through, and how to maneuver the couch on the staircase once they get that far -- but it's nothing they won't be able to handle.

((Time skip to when they get the couch in place, unless there's something you'd like to do on the way?))