The truth is that there is no trick to slot machines. They provide random results based on set mechanics and it all comes down to luck. With that being said, not all games are the same, so picking the right options is key, and you can still change the size of the bet throughout the session for better results.
Players sit at the machines they were randomly assigned during tournament registration. When the tournament timer begins, everyone in the session hits the spin reels button and/or the bonus pop-ups on their machine and plays for the duration of the countdown.