Just be sure you have a good set of spring compressors. You can rent them at the parts stores, so you don't need to buy them.
Unless your preferred alignment shop is directly across the street from your house, before disassembling the old ones, scribe the location of the lower strut mount against the knuckle so you can get camber close. The Fiero is no fun to drive with a very bad rear alignment.
Be sure the spring donuts are replaced properly and the springs are rotated correctly to fit into the notches. I don't remember how many miles you have on your car, but I have a pair of OEM 88 springs with just less than 15K miles if you feel a need to replace those, too.