Now the next question you ask yourself should be: okay, but how can I reach that level of consciousness for myself? The answer is quite straightforward: by studying!
As I quickly mentioned earlier, the more knowledge we have, the more we'll be able to take a thoughtful decision. In landscape photography, that means that you'll have to learn all the variables that comes into play when you are out shooting: location, weather conditions, tides (if you are by the sea) or snow (if you are in the mountains), etc, etc. There are a bazillion different stuff that you should learn and they might vary depending on where you are and what you like to shoot. You'd think that landscape photography is already a quite specific niche, but truth is that there are a lot of “sub-genres” and rules are not the same for all of them. For example, if you live by the sea and generally shoot seascapes, you might want to learn how to deal with long exposures, how to intercept and capture the best moment when a storm is passing by (maybe even by shooting lightning); on the other hand, if autumn is approaching, you might want to find out which one is the best moment for shooting the foliage and give less attention to the weather; once more, if you plan to go on a hike in the mountains during summer to shoot wildflowers, you'll need to learn what is focus stacking and how to deal with it, together with a specific study of the weather in order not to find yourself into a dangerous thunderstorm. The list goes on and on as there are many different situations and many different environments to shoot in, but I think you got the point. You have to learn everything you can about the place you are about to shoot and understand which one is the best time of the day/year to be there. Once you are out there in the field, make sure to arrive early so that you can scout the place and find the best possible composition; at this point, if you really did your homework, you should have taken a conscious decision, based on a careful assessment of the situation.