You should see the V6 model! ;)

Use a large box wrench. The alternative is either to buy a special O2
socket, or make your own by cutting a groove out of one for the wire.
I use the wrench instead - works everytime.

Disconnect the battery cables FIRST. That way when you touch the hot
wire stud to ground, it won't arc out. :)

Save any shims that come out when you drop the starter. They are used
to "adjust" the starter fartheraway from the ring gear. I say "adjust"
because they actually accomodate for machining tolerances in the
different starter nose cones. With that said, the new starter may not
need them. You can try leaving them out, as they are easy to put in as
needed. (If you need to put them back in, start with the thinnest and
work pregressively thicker until there's no "clashing" noise.)

No real trick here. Use the boot to remove the wires, not the wire
itself. Free it up by twisting as you pull. Plugs? Again, nothing
special. Use the right socket and you'll be home free.

Enjoy the Fiero!!

Eric

do it with the engine hot, it will be much easier to unscrew

disconnect the negative battery lead first

do them both (plug & wire) one at a time - take one old wire off, take
that plug out, and replace with new stuff before trying another one.