Not sure what it's going to be like for this year, but I got there about an hour early last time and that seemed about right. The only thing that bothered me about that was Rico and others walking up and down and putting me in their streams several times. I know, it's a small thing and nobody was even looking at me, but I hated it.
I don't think I'd compare this to going to like MEGACON or something where you need a ton of snacks and stuff. You'll most likely be in and out in a few hours even if you go to a panel or two.
If you buy a coral, you can have a vendor hold them for you until you're ready to come back and grab it. Make sure you have a cooler to bring everything home in.
Other than that I don't think there's a whole lot to know, it's pretty simple.