Follow the light, let it dictate the photograph or be in place when the light is right on a specific idea. Also going to the same location over and over again gives an insight to subtlties as to how that evironment responds to light.
Light in the environment at the very least is going to change every 4 minutes anyway because of the earths rotation, so an awareness of where the sun is and which direction it is sliding aross the sky helps.
By deciding what type of light you want to photograph also helps narrow the decision making process down. Open shade light, shade light directional light and backlight each have their inherant qualities and problems so anticipating and responding with the appropriate films and filters for each light quality takes most of the thinking out and allows you to focus on images within the different lighting situations.