Yeah, Nexus says they give you 2 days training during install but it almost always amounts to no training at all. The other training given in PA., Chicago, or LA is a little more in-depth with a real instructor. You have to do the basic before you can do the intermediate I think. Intermediate is where they teach you to make workflows.
Good reason to upgrade? Kodak needs the money.
Seriously now, I guess if 4.2 is working okay for you then I can't. Are you running it on Windows or Mac? If it is on a Mac the days are numbered for legacy Classic apps. (Of course the days are numbered also for PowerPC apps. A definite catch 22 for upgraders at this time.