My louvers are hard to rotate, or they're too loose.

The good news is they're easy to loosen or tighten.

First find the tension screws on your shutter panels. They're on the side opposite your hinges and have a round plastic sticker over them.

Turn the screws to tighten or loosen your louvers. You have one screw for each section of louvers (as connected by the tilt bar at the back).