How do I change out the bulbs in my 2004 Lexus LS430?

My Headlights started flickering Christmas eve. I got a few opinions. The conclusion I came up with is that its either the bulb or the ballast. i would like to try the bulb thats working on the non functioning side but do not know how to remove the bulb. Can anyone help?How do I change out the bulbs in my 2004 Lexus LS430?Open the hood, look over the where the connectors are at. it is usually the one in the middle. you have to twist it counter clock and pull.