Leo, this gets harder the wider you go unfortunately.
I have a tiny (guide scope) bahtinov mask that I use with my 50mm lens with a few matchsticks to hold it on the lens hood. That is still quite tricky because the spikes are very small at that focal length.
Pick a bright star to make it easier on yourself. If you can get some magnification in live view, then the more the better. Still, without a mask or some other aid, it’s going to be very hard to nail it.
If you can hook your camera up to USB, I think APT supports Nikon cameras, so you might be able to get a live view in that which makes it easier to see?
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