I do a bit of racing - anything from 5k to ultra distances, in the process of coming back from a year long injury which is still not quite right. I do a lot of my training solo, but in doing this I find it hard to slow down to more of a 'training' pace, which is definitely where running in pairs/groups would help in training. I always find the race day atmosphere is easy to get caught up in, sometimes this can cause you to go out too fast and regret it later on, sometimes you'll have done the work in training and the feeling good on the day of the race will work with this and you'll maybe go faster than planned but it will work out for you, sometimes you'll set off a bit slower, sensible perhaps, and build it up depending on how the race goes and how you're feeling once your legs have been moving a bit. If the race has a pacer and it's the same as your target time (or thereabouts), it is good to stick with them - they're often happy to chat a little bit and offer encouragement, if you're comfortable with a few km to go, or even 1km to go, pull away and claim whatever extra seconds you can. An alternative to using a pacer is if you know someone around the pace you're aiming for to try to keep just ahead or behind depending on which side of target time they would be, you tend to learn this by doing a few local races or parkruns (local to whichever one you've entered in August). At the end of the race, you'll often get a boost when the finish line is in sight and audible, enjoy this - again, it's not much but a few seconds off your time.
Just one more little tip for race day training, practice your pre-race food as well as any gels and drinks you may take on the run, trying these for the first time on race day can end badly for your stomach!
Hope that's helpful