But you can disable or slow down the computer AI moves if you find it too hard.
The overall difficulty depends on the OCW difficulty level, which cannot be changed midway without digging into console commands. Especially that the enemy faction attempts those super-moves as well, and you have to decide whether to try to help defend them or let them resolve naturally in due course. In OCW it's a challenge to get from the end of the first battle of Whiterun to the final hold campaign. In vanilla civil war there are three hold campaigns in a prescribed order, and you are bound to win them (unless playing a Dead-is-Dead playthrough). It is expected that the computer AI will do the regular moves in turns, while you are responsible for planning and executing the super-moves on behalf of your civil war faction.
Are you perhaps familiar with Risk (the board game), or Dice Wars (a flash game)? OCW works in a similar way, with one Skyrim-specific addition: super-moves, which are battles involving all territories belonging to a single Skyrim hold, and the winner takes over the hold.