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Gotcha... to be fair until @Bobbo ‘s seemingly simply steps to sand a floor I was very ready to pay for somebody else to do it. With said instructions I’m still probably going to pay someone to do it because I know I tend to do a bad job and then pay extra for a a fix of my fuck ups and then the cost of the original job BUT it does also give me the belief this time I may be able to do it myself!
As long as they're sound and don't have super-deep gouges (although they can be filled) you should be fine. If they've got some kind of coating, maybe figure out what it is because it might make nasty dust or clag the sandpaper.