To take the headlight bulbs out pull the black plug off, then pull the grey rubber bung off, then theres a metal clip that you need to push inwards and to your left (facing the vehicle). With the air bag light its a common problem, checking the pre tensioners under the seat is the most obvious thing to do but sometimes the light will turn itself off. If youre that bothered by it take it to a garage and get them to sort it out. An bloody hell not many people from drayton on here, get some pics up of your saxo and il keep an eye out