If you're a Key Grip, you won't have to worry about touching the lights. (If you it's a small shoot where everyone does everything, my best advice is to make sure to have the light on the tail gate of the truck, move the crank up to the gate and load the light from off of the gate onto the stand. It's a lot easier to lift up and over than to lift the whole light from the ground to over the stand and down.)
The biggest thing as a Key Grip is to make sure that things are safe. Don't put up a 20x20 without a lot of weight and ropes tying it off. Have some extra hands stand on the stands if need be.
Always make sure the producers have courtesy flags set for them at video village and make sure the lens isn't getting pinged with light.
Other than that, have fun!