Good for you! I think that Codependent No More is one of the best books out there - Melody Beattie is a genius! I also have the workbook and have been completing exercises from it over the past few months - it really reinforces the principles in the book and helps me stay on track. Journaling exercises really work for me - I can be honest with myself and not fear what others will think about how I am feeling, and I can go back and re-read what I have written and reflect on my feelings. Journaling is very therapeutic - it helps me see how far I have come, how much I have improved my own life, and it makes me feel good about myself.
Continue to use the workbook - you will be amazed with the results.
Melody Beattie's, The Language of Letting Go, is also a wonderful daily reader, and there is a matching workbook. If you are enjoying Codependent No More, you should definitely consider ordering this one as well.
Keep working on YOU!