How do I sand and restain hardwood floors? DO I have to rent a commercial sander?

You are getting the wrong information. Remember sanding is GRINDING away a surface. I would strip off what they put on then clean with steel wool and then if needed sand very lightly with 220 garnet paper.

If I was you and wanted to do this myself,i would go to Lowe's and buy a floor restore kit for about $60.00,and follow instruction.my philosophy is that if you have any doubts,then leave it to the professional. Where most people mess up on a floor,is when they apply a product not recommended for floors. The result you are trying to achieve,is like a basket ball court.

More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.