tripod or find something secure to rest your camera on. if u don't have a tripod and u are out in nature, u take something soft like a towel or jacket...crunch it up on a rock and place camera on it.
use the 2 second delay feature (in the Q menu under drive mode). if u use the shutter button without this and press it the vibration will ruin your photo
close aperture to f/8 or f/11 or maybe a little more. iso 100
then experiment with different shutter speeds depending on lighting. if its early am or pm or u are in shade its easier to get a long exposure. otherwise u need an ND filter
this is an 8 second exposure shot in very overcast conditions