andy -
try the inside frame rail on the drivers side. this will require you to jack your car up to fit under there(please use jackstands NOT just the jack) a safe way to find it is to find the gas tank(pretty easy to spot) then look for the fuel line exiting the tank. just follow it until u see a cylindrical device inline with the fuel line. (on my first gen the fuel lines connected to either side of the filter were also labeled "Filter")
n2mud - first gens arent that bad. the trick is to remove the bracket it is mounted to, then slide the bracket back(it wouldve been a huge PITA to release the hose clamp that holds the filter to the bracket) then u can fit your fuel tools in there to get the lines off. three words of caution:
1)Release the pressure on the fuel line BEFORE getting under the truck!!! The system can be depressurized by locating the schraeder valve on the intake manifold(on my first gen, it was on the pass side next to the coil pack) and u can depress the valve with a screwdrive(small torx bits - like a T5 work great!) gas will spray out, but it wont damage anything(except maybe the finish on the floor in your garage) which brings me to my next point
2)Always use protection. Wear goggles especially if you forget to relieve the fuel system, u dont want gasoline sprayed at high pressure into your eyes. Put a tarp on the floor under your truck to catch excess fuel, and have an empty pan nearby so when u remove the filter, u can drain the extra fuel into the pan instead of the ground(i wouldnt reuse this fuel since, at least on mine which had a real old filter, it was yellow and crap was floating around in it)
3)WEAR GOGGLES!!! I know I said it before, but goggles are not an option on this task, they are NECCASARY!!!! Not only are you working with fuel with u dont want sprayed into your eyes, but the underside of the car not only has large amounts of road dirt on it, but is very likely covered with large amounts of rust (ESP in a first gen in the northern parts of the states) I have found that whatever I touch on my undercarraige, rust will flake off and due to gravity, always fall right into my face. Not fun if you arent wearing goggles.