TOAW is not that difficult to learn in terms of basic controls. The tutorial scenario does a fine job of that. The tricky part is knowing what the heck to do once you fire up a real scenario and are handed an entire army to command.
I have this problem with several wargames, the "how" is not that difficult but the "what" and "why" are real head-scratchers. Which to me is the mark of a great wargame.
The larger scenarios can be overwhelming. Begin with the smaller scenarios and then gradually move to larger ones over time is usually the best advice. Defeating the Soviet Union in 1941 was something even the real-life planners had a problem with.
One of the really nice features that version 3.4 brought to TOAW, was the ability to put your army under AI control apart from the formation(s) that you wish to control directly.
Take for example the monster scenario Europa 1947, a beginner would be easily overwhelmed by the size of it. But if playing the allies for example, you can elect to have the AI control the entire allied force apart from, let's say, the British 10th Corp - a formation with only five units in it.
So all you need to do, as a player, is control those five units while the rest of the war goes on around you. Or perhaps, you might feel up to controlling the eight army, or the entire Commonwealth force. Or the French or the Russians, or the Americans. Better yet, you can alter what you directly control on the fly.
It gives players the opportunity to tailor the scenario to exactly what they think they can handle while still participating in a gigantic war to liberate Europe. It's actually role playing in a wargame. Beginners need never feel overwhelmed no matter how large the scenario.
I love the smell of TOAW in the morning...