My main experience with SWAT teams has been from seeing them on TV and in the movies. I'm sure that's a highly exaggerated view.
While entertaining, I know the TV show from the 1970s was just that -- the TV version of how SWAT teams conduct operations. I have seen them in action on shows like "The First 48" and "COPS," which are probably at least slightly more accurate.
I know SWAT members have to be highly trained. In fact, police departments often look for persons with Special Forces, Ranger or SEAL training for their SWAT teams. These people are accustomed to dealing with dangerous, high stress situations.