Go to the rental store and have them (any of them) give you a walk through on their machine. All the technical questions should be answered then. Maybe they would even let you test drive a machine in the yard a bit. Do wheeled skids tear up grass? Answer: not if you go in a straight line and plan your turns to be in areas that are in the work area. Make gentle curving turns instead of sharp turns and the disturbance will be somewhat less. Make sure the turf is dry and not been watered and the disturbance will be less.