Naples International Airport is one of the largest airports in Italy and the Campania region in particular. The airport serves 45 airlines that generate passenger traffic of more than 6.1 million per year.
Always make sure that your baggage ticket attached to your boarding card contains the correct data.
Before going through the frame metal detector: remove your belt, take your laptop out of its case, etc. - this will speed up the whole screening procedure a bit.
If you want to relax in peace and quiet, put on headphones after starting, even if you are not listening to anything - this way you won't have to talk to your neighbor.