The first thing that you need is absolute commitment; and "lazy" in any way, shape or form won't cut it.
The next thing that you need is knowledge. If you don't want to go to school you obviously have to accumulate this on your own. This means that you have a lot of research, reading and watching to do. You can start with a search here on IndieTalk; there are dozens of newb threads as well as many more "which is better", "doing it on a budget" and more artistic discussions. There are lots of great books out there as well as trade rags and numerous other sites and forums. Watch films and then the DVD commentaries and extras. And believe it or not, you can learn more from bad films than from good ones.
You need some experience. Get out there and work for free on indie shoots as a PA, gopher or anything else you can get. "There are no small jobs, only small people unwilling to do them." Watch what other directors, producers and DPs are doing and how the cast and crew react to them. There are many lessons to be learned, both good and bad.
You need to learn and develop your management skills. "HUH?" I here you cry. Yup, you have to manage time, people, equipment and budgets to mention just a few.
Network, network, network, network, network.
Don't burn bridges; todays a$$hole is tomorrows producer.
And here comes the obvious - you need the equipment to capture picture, to capture quality sound and to edit everything you have captured. And don't go cheap on the sound - crappy sound has killed many otherwise worthy projects.
Your first attempts will be terrible. If you truly have the passion, the drive, brutal self honesty and the ability to assimilate objective criticism you will get better.