Four cylinder or six cylinder? Remember to always post what your Fiero actually is in every tech post.
I've had easier times removing them on the four cylinder. On 1985-1986 six cylinders, the engine has to be jacked up and supported on the harmonic balancer by a piece of wood sitting on the cradle to get to the furthest two bolts that are positioned on the "lip" of the pan. On 1987-1988 six cylinders the oil pan (and timing cover) were redesigned to be half moon shape on both ends, making removal slightly easier.
Whatever you do DO NOT get a cork replacement gasket, which is the common replacement gasket you will find. Get the proper gasket that "seats" along the flange of the pan and flattens itself against the bottom of the block. it will cost more, but works better. Even with plenty of RTV applied properly along the pan flange, you'll likely get leaks if you use cork.