I’ve spent a lot of time waiting in line for Hall H at Comic-con, and if you plan on waiting in line for Hall H I have three main recommendations.
First, don’t do it alone. Have a support team to trade off with for restroom and food breaks, to run out for quick panels, or to check out the exhibit hall for a bit. Set a schedule for shifts, and stick to it.
Next, be prepared. Bring sunscreen, a shade umbrella, folding chairs for everyone in your group, food, lots of water, games, and anything else you will need for (at least) 24 hours of sitting on the sidewalk waiting. Portable phone chargers were the big item in 2015.
Finally, be friendly. Make friends with the people around you in line. You’ll be together through a long day and a restless night, so you might as well get to know them. They’ll give you a hand when you need help gathering up your stuff once the line moves, and you can return favors for them when needed.
It’s rough, but you can see some awesome stuff when you tough it out. I’ve spent the night out many times, and been rewarded with some great experiences, like getting to ask George Martin a question during the Game of Thrones panel in 2014, and going to the surprise Star Wars concert in 2015. It’s not easy, but it can be made tolerable with a little help, the right supplies, and some new friends.