I bet the boys are excited and can't wait. You are giving them a lesson in patience for sure. And in being prepared as well.
When you pick out your snake remember the females as adults will get bigger but they also are better eaters. You will have less refusals with them. The males are smaller but also are more picky once they get to be adults. In my opinion anyways.
And try to get one that has been eating frozen thawed if at all possible. That will make your start much easier, if it is use to, and has been eating f/t. Once you get it home you should do no handling (once you put it in the enclosure) till it eats 3 meals. This will be hard on the boys but there's your patience lesson again. That will take at least 3 weeks. If you get any refusals you need to wait till you get 3 straight feedings. This is pretty important for acclamation. You might know all this since you are preparing so well but I thought I would mention it as a reminder.
And you should really check out and make a copy of the feeding chart that is on here so you can have the right sized feeders. Maybe even while you are at the expo and pick out your snake you can get some feeders as well. Check with the lady breeder they grow pretty fast so you might want to get a couple different sizes. By the way do you have some freezer space to keep some or will you have to buy (like I have to) a few at a time at say Petco or Petsmart or some other reptile store. It will be cheaper in the long run if you can get them in bulk packs at the expo. But not everyone has a lot of freezer space.
Here is the Eric Brunick feeding chart below.
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