Will Justice Alito be present to answer questions during the Senate hearings or will it just be constant blow-viating by the senators.
No, this will be all Senators, all the time.
The nominee won't appear on the floor of the Senate. There is precedent (Thomas) for additional Committee hearings following sending the nomination to the full Senate. I would not be surprised if the DEMs attempt that stunt again, given their past sucess with Anita Hill. They won't get their way this time. Welcome is worn out.