Well first of all with young dogs don't bring them to fireworks
We will have the TV on, and all our pack will gather together in our den.
I have some special treats, and older dogs too who are in-different to the noises. When they go off a lot, I do some obedience work, and tricks, and of course rewards too.
My puppy is too young right now, to go observe the fireworks (from a safe distant distant locale), but in Sept she will be out with me on fireworks night. We shall climb our local hillock and watch them from up on top. BTW an area she knows well. WE will have lots of treats and toys to enjoy the show. I also use sizzlers in the backyard - at least they throw out some wacky light.
I agree not to pick them up or coddle them, but to be there and very present for them. If they want to jump on your lap so be it, just treat that like any other time they want to be up on your lap. And most of all just be relaxed in your own being, you don't need to add your tenseness or nervousness to what-ever your dog might be feeling.
I hope you have a stress free July 4th