I never went to film school (I have a degree in accounting and make a living as a software engineer, I know long story) but I have always had a passion for the industry. I have learned a great deal from this site (and others like it), meeting groups, books, magazine subscriptions, DVDs, seminars and now I am about to put that knowledge to the test and make my first short (from soup to nuts). To reiterate what has been quoted above, the best way to learn is to put the work in and make a movie of your own. Will you make mistakes? Of course, but you learn from them.
I live in Harrisburg, PA and besides sites like these, I don't have ready access to real pros in the business (yet). So I sponge-up all I can from all places. For books, DVDs and supplies I frequent The Writers Store (
www.writersstore.com). They have some really awesome books and DVD seminar series for reasonable prices. I have also purchased DVDs from Video Maker (
www.videomaker.com) and subscribe to their magazine. Their stuff is not as detailed but it's a start and information that you can put into practice almost immediately. For a step above check out the training materials at VASST (
www.vasst.com) - though most of their stuff is targeted towards NLEs (like Vegas) or specific cameras they have some general topic courses (lighting, directing, audio) that are pretty good for value (they are a bit more than the stuff from Video Maker though).
At the end of the day, no matter how you gain the knowledge (school or self-taught) or how much you can fit into your head it all comes down to execution. Make a movie. Enjoy it, learn from it and then make another one, and more after that.