There is just no way to experience these pieces by looking from the outside, or in photos or on video: the initial view of them from the balcony above the Arcelor gallery is impressively dramatic, yet it's the merest pipe-opener to what unfolds close up and at floor level.
I would rather have the horse fit by the week-end preceding the three-day event and then, apart from a good sharp two-furlong pipe-opener after the dressage test before cross-country day, only do slow but interesting work, if necessary for long periods if the horse has an excitable temperament.