As Guide Dog Saint suggested "well-organized" would be a much better word choice. Using "well-planned" to describe a person would imply that they were created in a laboratory rather than born naturally.

"well-organized" or "well-prepared" would be better, because that's the natural expression

I agree with GuideDogSaint. "Well-organized."

I think well-organised is more common.

As the others said . . . Well Planned should generally be applied to an actual plan (or something that was planned), not a person. You could say his party, wedding, military campaign, trip, etc were well planned.