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The main message of this work is that you have to be careful not to overwhelm yourself with the details when working toward a difficult goal. Implementation intentions have both a positive and a negative part. On the positive side, they help you to figure out exactly how to add goal-related activities to your life. On the negative side, they can also make it clear how difficult it is to achieve the goal.
If you find yourself overwhelmed by the details, then try to scale back your expectations. Even small steps toward a goal are better than no steps at all. For example, if you cannot get to the gym every day, try to get there at least once a week. After you add these new behaviors to your routines, you may find ways to increase your commitment to that goal later.