You own the tapes, go through the tapes at a pace that your lifestyle allows. Just as long as you avoid getting stuck on getting it perfect before you go onto the next tape. Its better to just do your best and continues with the next tape and once you have gone through the course once you can then start over or just listen to the tapes that help you in the areas of your weakness. You'll find that you will have the system working for you much faster that way.
Alex