Be prepared to be overwhelmed.
As we walked over the pedestrian bridge, looked out over a literal sea of rooftops, I said to the wife: "we're in deep sh$%&t now" We were there for nearly 6 hours and I don't think we covered a third of the show!!
Our first visit to the Hershey RV show was a blast!, exhausting! perplexing! But mostly a huge education. We did lots of web browsing beforehand to prepare and went in thinking we really wanted a class A. We realized about halfway through the 14th isle (seriously!! it's huge!!), that A's weren't really what we wanted.
Our 2nd trip was a bit more organized since we were getting pretty serious at this point. We skipped over the model/units we weren't interested in. This allowed us to cover more ground and see more models. This gave us a good idea of floorplans we liked, and floorplans we could live with. We were then able to make a list of 'must haves' and 'it would be nice to have'.
We finally bought our TT last year (3rd show-trip). (this may be a bit excessive but) I made a spreadsheet of manufacturers that had the floorplan we liked, and models that checked off the most boxes. By the time September rolled around, we had it narrowed down to 3 manufacturers and 6 different units. Turned out, the one we liked the most was too heavy (story for another post). We ended up with one we liked even more!!
I think the biggest lesson learned from these shows, at least for us: buying a RV is all about trade-offs. To get 'this' you need to give up 'that'. That's why we had a list of must haves. The 'it would be nice to have' list actually was 'things we can live without'.
Most of all have fun!! Some of the best people we've ever met has been centered around RVs.