A little late, welcome to the forum!
I've been through all of this with a DSLR, I found a Bahtinov mask and image zoom a blessing. Especially when you have a heavier DSLR hanging off the back of the focuser.
I haven't read all of the posts in the thread and I'm sure either you or another experienced member mentioned it, either an app to trigger the shutter (which I think the D750 will do) or in my case of a D810, an intervalometer to avoid the slightest touch creating major blur in the images. Again (I did read this) a 200-33mm lens is a good start to get a feel for everything.
Good luck!
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