03 Deville highbeams and handling

I just bought a Deville 03 DTS. When I turn on the highbeams all the headlights go out. The bulbs don't look burned out, and they don't look easy to get to. Does anyone have any ideas about wiring problems with these cars? The column switch etc? How do you get to the headlight bulbs?

Also I have noticed when driving on curvy roads at a speed above 30 the car handles very badly. The steering is very unpredictable and when you try to turn smoothly it jerks and reacts all at once. Any ideas on common steering problems? It's almost like the belt is slipping and it loses power then regains it and throws the car to the side. Kinda scary...