on mine.. (dunno about a '98) there are two tabs for each headlight, (you can see them on the top of the headlight when you pop the hood) pull them straight up, and the whole headlight enclosure should come out the front. then the headlights are simply on the back, just a twist and pull away. then you just pull the lights out of the sockets. pretty simple, but when you put them back in it takes some patience you gotta play with the pegs and slide them into just the right spot and then slide the tab back down so it slides into a slit in the peg so it holds in firmly in place.
2001 Bright Island Blue Ford
Ranger Edge, 4x2, Ext Cab, 4.oL, Auto
Got the blue truck mod going on..