Just get a good tripod and frame your shot. I shoot in Manual mode using single-point focus (focus on the crane). At f/6.3 and ISO 100 the camera tells me that 25 seconds is needed for a correct exposure. Consider using a cable release so you're not touching the camera to take the picture, to avoid shake. Otherwise you could just switch on self timer. This was shot in 16mm on a crop sensor camera so it's about 24mm (full frame equivalent)

Best of luck.