Knowledge is easy to come by, there's a TON of it on this forum. If you've got a Fiero problem, most likely someone on here has had it before you.
Experience on the other hand usually arrives just after you need it!
I've always said I'd never buy someone else's swap. Who knows what they did. It may work but is it safe and is it reliable are the two big questions to ask.
More important than anything else though is budget. Do you have the funds to buy the gear/tools you'll need to do a swap yourself or to even work on an already done one that maybe needs 'work'.
Also, are you married. I've found the wife limit for cars in garage that are not moving because they are in pieces is about 18 months LOL!
Anything I might say is probably worth what you paid for it, so treat it accordingly!