You won't be able to change their attitude easily. Start by having them adopt some new specific positive habits to take the place of their existing negative ones. With practice and reinforcement, the new behaviors will replace the old ones. Work is a low priority. Their focus is to find time to take care of personal matters or other interests.
Close monitoring is necessary to see how they are performing.
Therefore I remind you to stir up the gift of God which is in you through the laying on of my hands. For God has not given us a spirit of fear, but of power and of love and of a sound mind. God isn't the one making us afraid, He is on our side and His equipment in us is strong, courageous and not afraid of people, situations or circumstances. If you are not experiencing all of these attributes then you've got some work ahead of you to begin developing these traits. When you are burning with purpose and destiny, it's easy to keep your mind, emotions and feelings under control.