It's easy. Esp with coilovers since you don't have to take the assemblies apart. It's vey much like a VW golf in how it's set up (the back is about as easy as it gets though) Taking your sweetas_sed time I'm guessing an hour at the most.
Yeah I think its a straight forward process. Ive done them on a SVT Focus before and it was easy. Once I saw how simple the job is on the 500, I was also embarrased I didnt do it myself. Ive got a set of coilovers coming as well and come spring time I will do them myself