I just bought a 2018 Model X 100D with 17k miles. It is my first Tesla, my first EV, and far more than I've ever spent on a car.
I was nervous. I clicked "buy now" on a car I had never even sat in much less driven, and I hadn't even seen a pic of the actual vehicle I was purchasing. I had some frustrations with the app and became more nervous. I called Tesla a few different times, and every time I spoke with a real human who was very friendly and helpful. When I showed up at Tesla I was happy to find more of the same. The rep had plenty of time to answer questions about the car and seemed genuinely interested to show me some of the features. I had time to check out the car on my own during the short while he was inside finalizing transaction details.
My X was even more beautiful than I thought it would be. The rep was walking toward several. One in particular caught my eye and I thought "that's probably not mine but I will be thrilled with any of them matching the features". But no, the one I picked as my favorite was mine! I was ecstatic but tried to remain calm, make sure I could inspect it and not accept if there were big issues. I had driver profiles set up, my stuff connected, and lots of fun features enabled before he even came back to finish everything up.
I've had it two days now. Bought probably too many accessories. Drove everywhere. Went to a Supercharger. Played with the karaoke, "romance", and of course the "emissions test"
app while there with my wife. I was ready to take it camping and sleep in the back. As you've probably guessed, I absolutely love it. Hands down favorite vehicle I've ever owned.
Relax if you can, or read the manual if you can't sleep. I did, on the phone in bed, which I think drove my wife a little nuts. It will be amazing!