The DM program is unlike any scuba training you've had previously. It has multiple components (knowledge development, exams, skills development, stamina tests, practical exercises and an internship) and can seem quite daunting. One thing that really helped me was to keep up on my progress so that I knew where I was throughout the program. I used the PADI evaluation form where I would have my instructor initial and date whenever I finished a requirement. I also setup a spreadsheet version of the same to keep track of what requirements I'd completed and when as well as what was yet to be completed.
Also, be patient and approach it with humility. It is not a fast course, at least not if it's done right. Be willing to listen, watch and learn. The program is really designed to be a mentorship where you study and work under your instructor/mentor, so be sure and build a good relationship with your instructor(s)
Enjoy!