Can I buy it? Yes.
How to get rid of the owner after the closing.
Eviction or pay for the residents to move out which called cash for keys.
How to do inspection? Usually almost impossible as the residents may not let your inspector in.
will the owner damage the house before they move out? Yes, to different level. In most cases, holes on the drywall, tored down kitchen cabinets. In extreme cases, concrete in the sewer, or leave the water running overnight to overlow everywhere.