Congratulations on your first purchase! You have a lot to look forward to
I've bought from many different TDs here, including Andrew, and I have yet to have any issues with customs (knock on wood). They know what they’re doing when it comes to shipping across borders.
But of course, sometimes you’re unlucky and that’s a risk we take. I recommend familiarizing yourself with the sellers' TOS, as they usually outline how they handle situations where packages are lost or stuck in customs.