Set up the stand for the keyboard before getting the keyboard out or attempting to move it. Some keyboards are heavier than others, especially ones at the higher end of the price range. Make sure your stand is secure and on level ground before proceeding.
Use both hands to move the keyboard onto the stand. Settle it into position, making sure it's evenly balanced.
Plug in the power cord to the keyboard, then plug that cord in to a power source. This is the safe way to power your keyboard and any other appliances.
Take the lead and plug it into the snake multi-cable connector. Make note of the number you plugged the lead into. This way, when you get back to the sound booth, you'll know where the keyboard is plugged in.