With all the above taken care of, the only thing left for you to do before (and during) race day is keep going and stay motivated. You can give yourself additional drive by running with a friend, running for charity or setting small goals for yourself throughout your training. Many runners also opt for a few sessions with a running coach. While this can be expensive, a good coach will be able to provide high-value, personalised marathon training advice.
Once you get going, you might find that feeling stronger, fitter and faster week by week is all the motivation you need.