relative difficulty of planning vs implementing

[Oogiem]

So, can I conclude that executing a task requires a fraction of the brainpower that planning does? And vice versa, that planning is an order of magnitude more difficult than executing?

And if so, I better save my best hours for planning?

True for me. Planning best be done when I am at the top of my game, fresh, full of energy and ready to tackle bears. Doing can be done in a sleep deprived fog for most things if I planned it properly.