Just released from jail and yearning to commit some crimes? Don't risk getting killed in robberies, come steal some cars instead!
The Grand Theft Auto Mission can be started as a civilian. To start, go to the Junkyard icon 
on the map and type /mission. There are 3 mission checkpoints in total at El Burro Heights, La Puerta and Grand Senora Desert. Each location will have unique vehicles to steal. You will have 24 minutes to complete the mission.
When you start the mission, you will be given a list of vehicles to steal. Search the map for the vehicles. You can steal parked cars or pedestrian vehicles, but you cannot sell vehicles purchased from a dealership.
Drive the car back to the checkpoint as fast as you can. Avoid damaging the car to maximise your return. When you drive the car into the checkpoint, press 2 to sell the vehicle.
Continue to search the map for the rest of the vehicles. You will receive a reward for completing the mission.
Type /cancel at any time during the mission to cancel it.