Highly recommended for all first-time marathoners. Even if you're a speedster at completing the 5k or 10k race, we suggest following a beginner's schedule. One of the worst decisions a new marathoner can make is training at a level that is too difficult for your body to adjust properly. You might risk injury either before or during the race. It is best to simply set your goal on finishing the first marathon rather than on how fast you can complete it.
Many runners stay at the beginner level of training for their first few marathons.
Perhaps you should take a step up to the next level. Intermediate schedules are often for runners who have some experience and might want to improve on their times. At this level, you might add another day of running to your weekly schedule, or perhaps speed up the pace on long runs. Immediate runners also increase their total weekly mileage. Then the experienced schedule might be for you.