Hi,
I'm on that online seminar as well.
I did find the timeline process confusing at first. Since I'm a French person and english is not my native language, I attributed the failure of the process to this. Finally, by going over it again, I realized that it was my personal resistance to change that was the source of the process not appearing to work.
I've had success with the timeline since, on a variety of issues. Some issues still resist, but it's maybe only a matter of persistence.
Sometimes, it takes some insight to realize that you have some underlying feeling that is sabotaging what you do, even with the best of good faith. This underlying feeling is the thing that must be dealt with first. Usually it's a feeling of fear, or concern for one's emotional safety.
Keep going, you'll finally pull through !
Erwan