Get a Saurus Oldblood with all Saurus Warriors with Shields and 1 siege beast (even a Feral Bastilodon will be fine) so that you do not have to build siege equipment when attacking settlement. To avoid spending forever on hero management, the only heroes you really want to recruit (if any at all) are Skink Priests with the Specialist, Wound and Steal Tech skills to boost your research rate Skink Chiefs for their Replenish, Damage Walls, and Assasinate skills to clear enemy hero spam and help your armies win sieges and Scar Veterans for their Wound, Assault Units and Assault Garrisons skills and for scouting the map.
For the Lizardmen, when you factor in siege battles, UPKEEP, Skaven ambushes, enemy doomstacks/range-heavy armies, building choices and province management, I believe my suggestions below provide the ideal baseline to give most players an easy, stress-free campaign: The main purpose of my guides is to help all of you reading them avoid the frustrations of wasting time due to ignorance of the ideal.