I'm afraid being a little nervous during a pool build is very common. It's a big expense for something almost permanent.
I love hearing how you came up with your pool design and placement in your yard. I think you've succeeded with both. Is that part of your nervousness? You've had this dream and vision of a pool, so you are worried it won't match what you hoped for? I know I felt very much like that.
Answer this question... Do you love being in or near the water? What is it you like about it? If you are like most of us on this forum, your pool will be perfect once it's finished and you're getting to finally enjoy it!
I don't always have a lot of confidence in my decisions. So when my pool was being built I allowed myself to worry about the stage happening right then. Once that stage was finished, I didn't let myself worry about it any more. Then I worried about the next stage when it began! Lol! So now, your dig stage is over. Now you can worry about the next part! Or maybe you won't! I hope not, but being a worrier myself, I understand when others do.
Finally, look at all the people who have posted about your pool. They all believe it is going to be awesome! And they know pools!
I'm crossing my fingers that you will enjoy watching your pool being built! It really is an exciting and interesting life event.
Take care,
Suz