I'll be there, I never miss one.
Allow plenty of time - the second event last year was so big I struggled to see everything in depth in 6 hours.
Take no more than 2 mods and no spare juice or batteries or tools. The weight becomes a burden if you have too much stuff, and if the worst comes to the worst everything you could ever need is on sale. Take a backpack and not a shoulder bag for better weight distribution.
If you're not prepared to pay £10 for a burger or £2 for a can of Pepsi then pick up a Tesco meal deal or something on the way, though there are plenty of food outlets outside of the hall in the NEC.
Be prepared for an aural assault - the music is incessant and loud.
If you put your mod down to try some juice, make sure you pick it up again.
Lastly, don't go if you're a feminist sympathiser - you'll find the dozens of half naked women offensive - I don't know why they're there, but we have to live with it.