Use a tripod for the chrony. Just get a cheap one.
Have a pen and paper handy to record your numbers.
Play with the buttons and get used to the display options before you go to the range.
If you have a helper running and recording off the chrony, you can concentrate on your shooting.
If you buy the indoor kit (the overhead lights), and you pack all your shooting gear to the indoor range, be sure to bring your own extension cord and make sure you have a power outlet you can use.