Hi Chas
Most videos of players tend to point the camera at the keyboards to show the finger work, but if you see a player live you will find that the Bass Pedals are used just as much to give a solid foundation and drive to the music.
If you wish to play the Toccata and Fugue in Dm or other classical pieces then yes you will need training; however for most music you can learn it yourself.
E.g.: Bass pedals are laid out exactly the same as a keyboard, therefore instead of playing the bass notes with your left hand, play them with your left foot. (Its no different then going from an Auto to a Stick shift Gearbox, it soon starts to become second nature)
Hope this helps

Bill