Use Overlays
Use the overlays as much as you can. The range, movement, and visible hexes overlays are invaluable in determining the right course of action and avoiding unfortunate accidents.

Turn On Unit Bases
Units can easily get lost in trees and other parts of the terrain because the map palette isn't very broad. To help sort out matters, turn on the unit bases. The game may look less realistic, but turning on the unit bases helps you keep track of all those little infantry platoons.

Turn On Vehicle Facing
If you are partial to flanking movements, be sure to turn on the vehicle facing option, so you get the maximum benefit from your maneuvers.