There's the Emotional Clearing Guided Training, which I would recommend.
https://www.emclear.com/training.html
Sessions are always subjective and you don't have to be too rigorous in following the steps, but on the other hand, you do want to be aware of the basic theory behind the process. You should definitely be reading Deep Clearing or Emotional Clearing if you plan on getting into serious work on yourself.
It sounds like you did it right. The important thing is to be focused on the feeling, and to take it through the steps. It's ok whatever imagery comes up.