The only thing I find hard about colour photography is colour balance. The principles are easy to understand, the processing is a no-brainer, and the paper is cheaper than B&W! But I spent many an evening agonizing over 5CC of filtration, making test prints, changing one variable at a time, to make sure I was getting closer to the best possible result.
So get a set of Kodak Viewing Filters on eBay. Kodak does not produce them anymore, at least according to all the stores I called, but they are peerless for helping you with colour balance.
A colour analyser (not to be confused with a color analyzer!) does the same job, but it's another gadget to calibrate and hone. Some people find them invaluable, other people never need them. Start with the filters, because you must train your eyes first.
I'll second the Kodak Dataguide. Any recent edition will do, because you want it for the principles, not the product information. That information is available on their website. I like the old editions (60s-70s) because they are printed on stiff cardboard to allow all sorts of funky dials, calculators, and gadgets.
A general intro book to photography could also be helpful (Hedgecoe, Upton, etc) because they explain and illustrate well the principles of colour. For more advanced reading, pick up Ctein's "Post Exposure" but make sure you understand the basics first.
Get a good viewing light, a nice quartz halogen lamp for instance. It's likely to be the kind of light under which most people view your photos. Beware of metamerism.
BTW, whereabouts in this fine country of ours are you located?