I'd say your first requirement is to find somewhere flat to work on it. so far it sounds like an accident waiting to happen.
After that, a floor jack (about the only thing that will fit under a Fiero to jack it), at least two jack stands (I've done it with two to hold the back end up although it gets tight up front, you 'can' do it). Some chocks (blocks of wood cut at an angle work). I also put some spare wheels with 4x4's over them under the car as well in case the jack stands fail or topple. You cannot be too careful when crawling underneath a car.
I just jack the car using the center of the rear corssover on the engine cradle, yo can easiliy see it if you look under the rear of the car. Plenty strong enough for jacking although a floor jack is about the only think that will go under there which is why a bottle jack is no use (too tall).
You'll probably also need some pb blaser or similar release agent as the nuts on the tank straps are probably well rusted/seized up by now, and deep sockets so you can get the nuts of the long T bolts that hold the tank straps in place.
Remember, think safety. Will it fall and if it does and you're under there,m what's gonna save you from being crushed.
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Anything I might say is probably worth what you paid for it, so treat it accordingly!
Dave
www.ltlfrari.com
