I know someone who tried doing that on their own and gave up half way through.
It's really hard work and should be done by pros.
Basically, it's a lot of sending with an electric sender that you will need to buy \ rent, the dust is very toxic so you have to use a gas mask. Then a lot of cleaning to get all the dust out, then painting the floor with sealer and paint (again, both very toxic).
Really i would not recommend doing it on your own.