Calling CW on Instinctive Training!

CW, You’re a proponent of instinctive training for experienced trainees. But how much or what parts of training should be planned beforehand? Is your suggestion to plan a workout beforehand and make necessary changes to it on a daily basis or could one even go the gym without having a plan and do everything based on how he feels the state of his body is at the moment, assuming he has enough knoweledge and understanding about training and physiology and is enough experienced with his own body? Thanks!