This is precisely what I'm attempting to do here. I've tried practicing on cameras with built-in meters, but it's just too darn easy to check the meter. Not having a meter at all is forcing me to think about the overall light conditions from time to time, but outside that, I just worry about shooting. It's nice.
When you have and use a meter, you still need to think about overall lighting conditions. The most valuable piece of gear you have is right between your ears.