There was a show on the History Channel(?) several years ago which used re enactors with period kit and equipment recreating the conditions according to a British unit's war diary. While the incidents are no longer clear (I can't even remember the title of the show), the impression I got was the unit was well trained and well led by Great War standards, right up to the point they went "over the top".
The scale and scope of modern industrial war was far beyond what anyone had envisioned, and few people were prepared for the conditions that emerged. Even General Sir Arthur Currie needed quite some time to digest the lessons learned and devise means of preparing his Division, and later the Canadian Corps to deal with the conditions of trench warfare, then to shift to open warfare in the last "100 Days".
"The Myth of the Great War: A New Military History of World War I" by John Mosier presents some rather startling and controversial ideas about the Great War based on researching the French archives. The veracity of the authors claims can be disputed (by people better versed in the subject than I), but it certainly sheds light on the French part of the war.