Home DIY

Sanding wooden floors. I know a number of people have done this recently with enviable results, so I was hoping to tap into that knowledge. I have a couple of questions - pics of my floor below.

1. It looks to me as if our floorboards have had some rather hideous orangey stain/treatment at some point. Presumably this will sand off? The floorboards look a bit ropey to me compared to some of the examples I can find but I assume it's still reasonable wood, can anyone see any reason not to sand them back?
   
2. We have three rooms and one long hallway that need sanding. There is no way we can do it all at once (there isn't enough other space to put shit to clear all the rooms) - happy to follow the general advice of getting the pros in, but is the experience so terrible (dust, mess etc) that you'd recommend doing whatever we can to do over the same period (i.e. clear out two of the rooms and get them done in one day, then spend the night moving everything into the newly sanded rooms from the others to allow those rooms to be sanded)? I assume we really want to treat them immediately after sanding so possibly add another day either side of the moving to allow that to happen? I think ideally we'd split the job up and do a few months apart, but if the mess and horror is going to be so extreme maybe that is a bad idea...
   
   

Cheers!