Avoid repeating Way Shrines
Once you pray to all nine Way Shrines in the process of starting Knights Of The Nine do not commit a crime that will raise your infamy. You have two chances, and once you make a second mistake they will strip you of all the Crusader armor. If you have not gotten the armor yet, they will not let you wear it until you repent, which means going back to all nine Way Shrines again.
Impossible death
This is more of a bizarre glitch than a cheat. when you try to get the mace of zenithar in Leyawiin, the mace is separated from the player by a huge gap. TThe boots of the crusader are needed to get to the mace, and if you don't have the boots equipped, your character will fall and be transported out of the dream world thing into reality for another try. If your character's acrobatics is high enough, you can jump and reach the tower lower down and land on a ledge, inevitably killing your character, causing the game to ask you to reload a save, even though it's a dream.