I will preface this with the fact that I know nought about Nikon cameras, and that any advice I give is from my limited knowledge of the Canon brand....
In the camera settings, look for a Mirror Lock option. If it is there, turn it on. What it will do is on the first press of the button/remote trigger, it will raise the mirror. The next press will capture the image at your set time length. Also, don't forget to turn it off, for terrestrial photography!
As Doppler has mentioned, get a remote trigger if you don't already have one, as any contact pressure on the camera will translate to your image.
However, for a first-up, that is great detail! Keep it up.
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