Task 1: Getaway Vehicle
Once you've carried out the jailbreak, which is the first part of the robbery during the finale, you need a getaway vehicle to escape the cops and deliver King Tiny to Los Santos International Airport.
Although we have a trick where you won't even use this vehicle, it is a mandatory mission and must be completed to proceed with the robbery. We will get to the trick later. It is optional, but it will make your life much easier.
For the getaway vehicle, when you start the mission, you will be asked to break into a garage and steal the vehicle.
When you're inside the garage, eliminate all the enemies. Take cover by the boxes or the toolbox and start shooting.
Once you've taken them all out, you can choose the vehicle you'd like as your getaway vehicle. There are multiple options to choose from, and it doesn't really matter which vehicle you choose.
As stated before, choosing a vehicle for us is not an issue as we won't use it during the jailbreak. However, we selected the Annis 300R sports car.
When you're in your getaway vehicle, exit the garage and drive it to one of the three marked locations on the map.
You will find some enemies trying to chase you. You can ignore them as long as you focus on driving to one of the three marked locations.
You can choose any of the locations as all of them are near the station.
Ultimately, if you want to use this vehicle as a getaway vehicle, this is the best spot to stash it.
Once you've stashed the vehicle, leave the area to complete this task.
Task 2: Weapon Stash
In this task, you need to head inside an Ammu-Nation and look for a duffle bag with some weapons.
The unmarked weapons will be indicated on your minimap when you get close enough.
Collect the weapon stash and go to the police station to stash them there.
When you go through the automatic sliding door, you will see a suspicion bar at the bottom-right corner of your screen.
You need to be quick about it. Quickly get to the dumpster, stash the weapons, and leave the place.
Once stashed, leave the area to complete this task.
Task 3: Stun Guns
One of the bonus challenges of this robbery is to ensure you don't kill any cops. And that is done by incapacitating the cops using stun guns.
When you start this task, you must search a parking lot for a security vehicle.
It is hard to miss the vehicle. You need to search the yellow highlighted area for this "Patrol" vehicle.
Deliver the stun guns to your Salvage Yard to complete this task.
Task 4: Masks (Optional)
The masks play little to no role in this robbery and are completely optional.
Essentially, all you need to do is to go to the mask shop at Vespucci Beach and purchase any mask set for this robbery to complete this task.
With these initial tasks completed, you are now ready to proceed to the more involved Planning Work missions.