The Revell kit is literally a shrink ray of popular readily accessible parts of the era as one would find in Rod & Custom, Hot Rod, Popular Hot Rodding, etc. In that era, the aftermarket would practically throw parts at them to get them in the boxes and in front of impressionable young men.
As Mark said, it is NOT a kit of whole cloth, it is a stack of parts in one box. In that way, perhaps as Jim Keler intended, it is the 1/25 version of a 1:1 project that will need infinite fiddling and fettling to get a good result. You learn on the tabletop then take the knowlege to the garage.
A novice will be lost. But if you have some knowlege of the era, the commonplace builds of the time, and how things generally go together in a 1:1 you can get through it.
Best coaching I'd give is to carefully plan the work, first. Treat each sub-assembly like a model (as Jim intended) and then join them to make the finished product.
That said, the same amount of time and fettling devoted to the AMT Fiat will likely give a better result. But heck, do both, it's the first time since penny loafers that you can build both with no hesitation.