Vassal is a wonderful tool to have in hand...
Ability to set up and experiment, record things, --- invaluable....
Then mentorship is useful for getting up to speed on the great work Peter has done (with some help...but, really, Peter....)
I moved to Thailand---and I still get to play weekly using Vassal...it's a high point of the week...
as my Russian infantry evaporates before the onslaught of Barbarossa.....