Ready all your documents. Keep your passport or ID and your boarding pass handy, security guards and passengers behind you will appreciate it. You can get one of these travel wallets or keep your documents in a front pocket for easy access.
Take everything out of your pockets. Once you are close to the bins on the security check queue, your keys, coins, etc. must go in the bin along with your sunglasses, the watch, the wallet, and your belt, shoes and jacket.
Drink the water in your bottle. You want to stay hydrated throughout your flight but make sure your bottle is empty for the screening (you can fill it up later).