Being aware of your posture during your day is a great thing, but consciously correcting your posture is not enough to fix it. First of all, most postural imbalances are things that we are not even aware of, and even if we are, they are not easily corrected by thinking about them. Examples are hip elevation, anterior-posterior hip disparity, femoral disparity, or valgus/varus knee alignment. Additionally, if we are consciously trying to correct our posture, what happens when we get busy and forget about our posture? It will go back to its old patterns. It is very hard to stay aware of your posture 24/7!
It is important to remember that our posture has developed over years and your body has layers of compensation that you can not correct by thinking about it. These imbalances most be corrected over time with very specific corrective exercises that are specific to you and your unique imbalances and performed in a particular order based on your disfunction and compensation patterns. As your exercise routine causes postural changes in your body, the exercises must be adjusted and changed to keep you progressing. When this approach is taken, posture improvement is certain, and your mind is left free to focus on other things.