Hi Jake;
I have looked at the 'Fiat500America.com' site--strewth, the Yanks do believe in doing things the hard way! When I was at Radbourne Racing clever special jacks just weren't available, so we used to support the engine with a block of wood under the sump and remove the crossmember as the first 'big' job. With the cross-member out of the way, all parts of the engine become very accesable, even the bell-housing studs can be got at by just reaching round the engine. Undo the top 2 nuts first, this will allow you to get the starter out of the way. Undo all the bits other people have mentioned, including the 2 air-duct tubes (1 from back of fan housing to air inlet under the rear window and 1 from the right-side engine shroud to the into-car opening). If you make the block under the engine fairly long, in the front to rear direction, you will be able to keep the engine on the block when you pull it out--remember however DISCONNECT THE BATTERY BEFORE YOU DO ANY WORK REGARDING THE ENGINE REMOVAL!!