swoping the head lights over is quite an easy job, the first bolt is on the top as u open the bonnet, the second is on the side near where the grill would be if it was shut, and the third and most anoying! is located under the eye lid thingy at the bottem, which just clips off, but be careful there a lil fragile
once all bolts are off, just unplug the wires and "gently" pull it out, best way is try not to brake anything lol
hope this helps!
this is asuming you have a mk 2 saxo