Reduce speed at exactly the right time to be at the speed limit at the control line and press the speed limiter button, drive in the pit, avoid other putting cars pulling in and out of their boxes, line up to their teams box precisely stopping on the marks so the pit crew are in the correct locations for the stop, pull out of the pits without stalling or hitting other cars in the lane, and finally press the limiter at the right place on the way out.
It's a pretty busy time.
To keep it as realistic as possible the only time you can really have a drink or get yourself comfortable is when you are in neutral at the box when the car is in the air.