So we moved into our new home a few months ago. I pulled up the hideous lounge carpet and found floorboards underneath in pretty good nick. They really need revarnishing though but I'm totally clueless about these things. Do I need to sand it first or can I just varnish over? Do I varnish or wax? I've got a dog who is already finding the floorboards quite slippy so would wax be better or worse for him for grip. Also I have a 3 month old baby, so is it feasible to do this job now or should I put off until he's a bit older?