MKitten is to be neutered tomorrow. Obviously rationally I know this is of course for the best, but still have The Fear. 
He and MCat (both boys) spend most of their time doing rufty-tufty together, which they both enjoy lots. Sometimes this becomes quite violent and elicits squawks.
Can anyone advise me if/how I should keep them apart, and for how long? My house is pretty open plan, so only option would be stashing post-op MKitten in a bedroom.
Also, I can't recall if stitches or glue are used for neutering now.
TIA