Good Job! I would suggest though, if you did not, wearing gloves (just simple latex gloves) when handling used oil. Stuff is pretty toxic. One of the main purposes of oil is to clean your engine, which means it contains concentrated combustion byproducts and wear materials from your engine (e.g. lead from the bearings).
It's not going to hurt you for occasional exposure or skin contact, but can be _really_ hard to wash off your hands and easily be something you transfer to food items and then ingest. Eye protection is a must too.
Another way to save on your oil is to not hold to the specs of engines and materials from the 60s. The 3,000mi/3 month rule is ridiculously outdated. Consult your owners manual for the proper schedule. Most modern vehicles (i.e. made in the last 15-20 years) have significantly longer intervals (5k, 7.5k, even 10k). Just Just make sure you are using a properly certified lubricant (i.e. oil that meets the specifications of your auto maker, which is also described in the manual). That much _does_ matter.
http://www.bobistheoilguy.com/forums/ubbthreads.php is an interesting site that is populated with "oil geeks" that has a lot more information (including objective lab tests) about oil change needs, oil quality, etc. For example, most people think dark or black oil means the oil needs changed. That's not (necessarily) true. It typically just means the oil is doing it's job (cleaning your engine).