The difference in training and practice
Training is learning and developing the required skills and techniques required for a particular endeavor. In shooting, these skills include stance, grip, sight alignment, sight picture and trigger control. Honing these critical skills will make you a much better and more proficient shooter.
Practice is the regular review and implementation of the skills developed during training. But, whatever you practice you will do under stress. It is imperative that you do not practice and ingrain the wrong or poor skills required to effectively deploy your self defense firearms.