After you warm up, line up with runners of similar abilities on the starting line. If you haven't been tearing up the pace on your training runs, do not line up on the front line or towards the front. If you've been training with friends that roughly equal your ability and have the same race goal, find them and line up with them in the starting-line pack.
Do not worry about being nervous before the race. If you're not nervous before a race, your heart isn't beating. Just don't stress out over it. If you prepared well in your training, you are ready for your first race and you can conquer the challenge ahead of you.
During the 5K: Pacing and Strategy
Once the race begins, remember to start slowly. Do not let your adrenaline, excitement and nerves take you out at a faster pace than what you practiced in training. You could use the first 5 to 10 minutes of the race as your warm-up to ensure you do not go out too fast. Going out too fast will drain you of your energy, and you might have to fight hard to finish.
As you run, breathe deeply from your stomach. Consider breaking a 5K into four parts: mile 1, mile 2, mile 3 and the final 0.10 miles. Take it one mile at time. You'll be surprised at how fast the race will go by. Breaking the race into smaller parts will keep you from getting overwhelmed.
Pacing your first 5K is vital to your success. If you can carry on a conversation the first mile, then you did not go out too fast. If you're gasping for breath, you went out too fast. It's better to go out too slow and gradually pick it up as the race progresses than go out too fast and struggle to finish. Once you hit mile 3, run tall, increase your pace and effort some, and prepare for your final surge to the finish line. There is nothing more empowering than passing people in the final stages of a race.
Run the tangents on the race course. As you make your way through the 5K, be on the look out for turns and curves, and avoid taking the scenic way around. Taking the turns wide will add distance and time to your race.
If you need water during the race, don't hesitate to take advantage of the aid stations. Make eye contact with a volunteer at an aid station. Even point to them, letting them know you plan to take water from him or her. Walk if you need to, and grab a cup, pinch it from the back, and drink. Pinching the cup from the back will allow you to funnel more water into your mouth. Once it's down the hatch, get back into your running pace. If you have the energy, thank the volunteers for being there. Races would not exist without the kindness of volunteers.
Finish and Post-Race
Celebrate your finish. You only get one first 5K, so make it count and take it all in. Run to the finish with what you have left in your tank. Once you're done, celebrate your accomplishment with family and friends.
Do not forget your post-run recovery. Refuel with carbohydrates, protein and/or a sports drink within 30 minutes after you finish; it will help replenish your body's glycogen stores and aid in muscle recovery. Static stretching for 15 minutes post-race will prevent some muscle soreness. Congratulations on finishing your first 5K!5K.