When you are trying to sad your own floors, things may get a little rough. You need to understand clearly the basics of this procedure, so that you can decide for yourself if you are up to it, or you will just call professional help.
Either way you chose, you need to know some facts: some hard wood floors are harder, and some are softer. Some types of wood need more sanding, repeatedly, and some need no sanding at all for more than five years.
First thing you (or the professionals you hired) need to do, is to remove all previous finishes or other stains. But for you to do that, you need to first empty the room. You should also remove any chandeliers or clocks that hang around, because they will get in the way.
Also, be sure to remove any staples and to ground down at least 3 mm all nails that might have come up in time.
After this, all you need to do is plug the sanding machine. In case you hired professionals, than it is time for you to lay back and relax, while your floors are being sanded. After the floor sanding, you may also pay for varnishing, or you can do it yourself, it is not hard, but be careful to start from the most remote corner of the floors, than go backwards to the doors, so that you don’t have to step on the varnish, later on.
Afterwards, all you need to do is wait, until the floors are dry, and then clean them up with a mop.
They will be shining in no time, making your house look pretty again. Try it yourself, or hire the professionals to do that for you.