I changed the fuel pump on my 1989 Taurus SHO, 1.5 years ago, just before getting my 2004 SXT. I did it without dropping the fuel tank by making a trap under the rear seat because I had clear instructions on where to cut and because I was afraid dropping the fuel pump might be more than I was willing to do with rust seized bolts etc. I ended up buying a Walbro fuel pump with a bit higher capacity than the stock model and costed around 90$.
I started cutting the floor with a dremel until I was sure I was clearing the fuel lines and finished the cut with a grinder. The trap door size was about 8" square allowing enough clearing space to remove the old pump. If you end up doing it that way pay attention not to bend the float arm that serves to indicate the fuel level in the tank. Also notice how you end up removing it as you will need to put it back in the same way. I say this because you might wonder how to get it back in in such a small hole without bending anything. I could find the web reference if you wish me to although it was for the Taurus SHO.
If you choose to get it replaced through the trap door method and wonder where you should make your cut, you should look underneath at your tank and find a reference point. Find a removed gaz tank where you can see the top opening, where the fuel pump goes and calculate the hole location. You could now transpose its location from a reference point such as left rear door sill location and work from there. The trap method is much easier than having to empty the fuel tank, jacking the rear of the car, removing the tank's holding straps etc.