It's a game of imagination. You start by describing in your own mind how the gas station is and why you work there. After that you roll an event on the d66 table (throw 2 d6s and use one for the tens nd one for the units) and imagine how your character will react eventually following the test rules for difficult things/adversities. If you successfully survive it, you shall roll a new event until faliure. Your goal is to resist for the longest time without dying, becoming mad or resigning.