I'm often asked, "What pace should I run my first marathon?" My response never waivers: the pace that the day gives you. As I mentioned earlier, it's a challenge to select a perfect pace or finish time for any marathon, let alone your first. The best way to finish strong is to pace from within using your breath and your body.
Keep it simple; tap into your inner GPS. Run by color and tune into your breathing, heart rate and perceived effort (how you feel on race morning). For the first 14 miles, run at an easy, conversational pace, or in the Yellow Zone. If you're unable to talk while you're running, you're going too fast.
From miles 15 to 24, dial up the effort to what I refer to as the Orange Zone, or the pace where you can talk but only in 1 to 3 word responses (not full sentences). For the final 2.2 miles, you'll have the energy to push hard to the finish and hit the Red Zone. This is only possible if you conserve your energy early in the race and avoid going out too hard—which happens to be the number one mistake most runners make on race day. Be the tortoise not the hare; start off slow and steady.
You can entertain yourself and keep your pace in the final 10K of the race by going "fishing". Cast your invisible fishing line and hook a runner ahead of you who went out too fast. Reel them in slowly, staying in the Orange Zone, and focus on the next person. There's nothing more empowering than passing people (nicely) in the second half of a race. It keeps your mind mentally activated, focused, and allows you to run stronger than you could ever imagine.