Believe me, it becomes pretty obvious when you have the lock cylinder out of the door and sitting on the table in front of you. Since it'll be your first time, take a picture of the spring on the back so you can put it back on the same way. I'd reverse #4 and #5 too. Sometimes a tumbler and its spring can fall out of the core if there isn't a key in it to keep them under pressure.
It's also good practice to make sure there are no burrs on the edges of the tumbler pins, and to give it a good dusting with graphite lock lube before you reassemble it.
'89 YJ 4.2 5 speed, Spinnaker blue/grey, hard top and doors, vintage fitted rear speaker boxes but otherwise stock and RUST FREE!!