Ignition Override- The A320 can despatch with the autothrust u/s, but the reliability of the system means it rarely has to. When it is necessary then the aircraft is not particularly difficult to fly and power settings are relatively easy to find if you've spent a little time looking at the gauges previously to know some ball-park figures. Manual thrust control during the approach is a complete doddle and in my experience about 30-40% of approaches are flown fully manually. It really isn't difficult to fly manually and technically should be no different to fly from any other jet which doesn't have self-moving thrust levers, apart from the absence of the trim wheel or the pitch/power couple. I've actually known crews fly 1hr sectors without autothrust, autopilot or flight directors just for fun!